So Im not exactly sure what to do now (Gamesrepublic)

It should be dated from the date of your original return/refund email, not from when they get an opportunity to address it, so you should be perfectly safe. I'd send a follow up email weekly until they address it.

How did you pay? If you used a credit card, then (politely) tell them that if they don't resolve the matter you'll do a chargeback. That usually gets their attention as they hate chargebacks.
"Hi guys, please let me know what is happening with my refund request, as I'm reaching the time limit for which I am able to lodge a charge back from my credit card company, and if I don't hear from you within the next 48 hours I will assume that it's ok for me to file a chargeback, using this email as evidence that I have tried to resolve the matter reasonably with you."

In all my years of online shopping I've never had to do a charge back, as the company will always make a plan rather than get hit with chargeback fees.

Seriously though, don't feel bad about it, they have a refund policy because of the law, and this is absolutely not you abusing the system, it was a genuine mistake and you've not used the key. If anything this is a classic case of why the laws needed to be changed, mistakes do happen.

Had the same problem year ago... traded the key in forum for more then i paid for... but i don't think you get 40$/€ for it... :/

Like poster said above... canceling the payment is best way to force them...

Mi volt a baj a Rockstar Social verzióval? Mindenképpen használnod kell, ha futtatni akarod a GTA V-öt, a steames változat így meg dupla DRM-et kap, ami miatt eleve nagy hülyeség ott venni (MP meg működik így is, úgy is).

Amúgy ha 14 napon belül jelezted, hogy elállsz a vásárlástól, akkor csak kitartóan csesztetni kell őket, amíg vissza nem utalják. Másfelől ez a GamesRepublic csak egy G2A v3.0, mert zéró kapcsolatuk van a kiadókkal és terjesztőkkel, csak ők Máltán jegyezték be magukat és egy ír szerveren futnak, így nem tudnak kibújni az EU hatásköre alól. Szóval ha nagyon húzzák a szájukat, fel tudod jelenteni őket az EFK-nál.

if they let those 14 days pass, it shouldn't be an issue. you sent a ticket/request between the refund period so it should be valid.
it's their fault they are slow.

One other thing you might do is include some details in one of your emails. Mention that your buy was a mistake, mention that you were told by their company to request a return for the unused key, mention the dates involved, and clarify that you have done everything in good faith. Hopefully, they will tell you something along the lines of "don't worry, your request was initiated in time and will not expire." You can then use that response in any litigation as an admission of their responsibility to return your money.

Refund policies are timescales for the consumer to reply, not for them to process. You are within the timescale so I wouldn't worry you should get a refund.

Right now Im thinking about waiting till friday evening and only after then opening a dispute with Paypal because quite frankly I would be surprised if they suddenly started reacting to my mails after having literally ignored me for 12 days.

FYI- If you funded the payment with a credit card to paypal and not your bank account you can do a chargeback with your card company. Paypal doesnt like it but there is nothing they can do about it.