Repeated Unsuccessful SIM Swaps

I have had an issue with my contract SIM card since June 2023. I woke up one day back then and realised that I had lost network on my phone. Unable to make and receive calls, and connect to the internet. I tried to SIM swaps multiple times (at my expense of course) and they were all unsuccessful. I still didn’t have any access. What frustrates me is that I spent the following years paying for services that I am not using on my contract, and with no one actually getting back to me on the matter. The issue was even escalated to IT department or something and they couldn’t resolve it either. I have tried again recently to do another SIM swap (at my expense again), and I am still unable to connect. When I call customer care I get a response that my number has been blocked due to multiple calls to Customer Care. What else am I supposed to do? I can’t visit the branch everyday, even if I could it is with no actual assistance. I am lost with no direction as to what to do next.