Poor backup service

Bought a Romos Zeus powerbank in 2022 from the Willowbridge branch. It lasted less than a year and @ R1200 not a cheap piece of ****. The supplier replaced it and the second unit again lasted less than a year Took the unit to the Worcester branch, waited for 2 months, git a call it was not under guarantee so I asked for a logical outcome! Please repair it,I'll pay for it Waited another 2 months, walked into the shop today just to be told the supplier cant work on the unit? Seriously Computer Mania!? How do you deal with a supplier with zero backup service?! I'm minus R1200 and minus power bank!? Not impressed with the service at all....