CC refunds

I bought a DeepCool PX1200G 1200W PSU (ATX3.0) online at Canada Computers to futureproof the rig for when I get my hands on a 5090. That's 2 weeks ago. Received the package (haven't opened it yet).

Now with the melting cable issues I guess I'd rather have an ATX 3.1 psu with the newer 12v2x6 connecter (the DeepCool PX1200G had the 12vhpwr connector).

Can I just go to my local CC to get a refund or do I need to go to the refund process online?

Or should I just keep the DeepCool and wing it? Got it for $164 (don't care about paying more for peace of mind)