Only repair phones to last 3 months, is ripping customer off

Myself and my wife took our daughter Samsung Galaxy A50 phone in for repairs in January 2020, weFix fixed the phone only to last for 3/4 months. Unfortunately due to lockdown, we could not take the phone back to the store when the phone stopped working 4 months after it was fixed. We then took the phone back to weFix 2 weeks ago who then told us the phone is out of repair warranty which is only 3 months long. This to us meant that weFix only fix phones to last for 3 months then it breaks again by itself, then we have to pay again R1500 to get the phone fixed by weFix on our own expense. So now we are expected to pay R180 for the assessment of damage the second time around which we are not happy with, since the phone is doing the same thing not powering on as when we brought it to weFix in January. The manager I spoke to had a don't care attitude when I expressed how we felt and that is very bad customer service experience. Not happy at all