WeFix and Samsung - combo from hell!

I took my phone to Wefix Canal Walk on 6 September regarding a Bluetooth and mobile data issue. I was informed that it was due to dry joints, yet the next day they decided to do a software installation. I asked how on earth they thought a software installation could resolve what is clearly a hardware issue, but they said it is what Samsung requires. I fetched the phone, but absolutely nothing had been fixed and I had to return it. I was then informed that the motherboard had to be replaced and then the next day that the part is not available and that the phone will be replaced. It is now 3.5 weeks later, I still have no phone and no ETA for when I will have a phone! I mail their customer email address and phoned their call centre twice 2 days, but still don't have a single response! How do they think it is OK for Anyone to be without a phone and much less with no ETA as to when you will have a phone? If the phones are not in stock, they should consider giving me a different phone with the same or better spec?!