Poorest service I have ever received from a service provider.

Very dissatisfied with cell c service my mother has a contract with cell c which I pay every month my mum took her phone in for repairs on the 23rd of September 2023 this month we going on 7 months without feedback. I paid access on 7/12/2023 nothing after that. I have been phoning and been send from pillar to post insure says there's no claim repair centre says the claim was handed over everyone involved were notified that the damage was beyond repair. So now I have been paying over R2000 for a non existent device. Went to cell c got into contact with the person who we gave the device to 7 months ago apparently she's waiting for insure to get back to her. Any advice because at this point we just want our money back and wouldn't recommend Cell C to anyone.