Rain appalling service

I would advise anyone thinking about getting rain to think again, I have been trying to get assistance since last year, finally today I have had not 1 but 3 phone calls, which means I have explained the issue 3 times over and over again and still no resolve. My Sim was lost / ****** with my router, they have confirmed there is no activity since Oct last year and confirmed that my account was still debited... Simple request I wanted to upgrade to 5g I asked them to pls tell me what I must pay in to do so as obviously I have a credit, which they now confirm is 1 month, however they want me to pay over R900 in arrears I ask you with tears in my eyes, how the hell can I owe you a thing if for 1 you bill me in advance and 2 confirmed on 3 separate phone calls today that I should be in a months credit. And to think I was actually going to upgrade.. I'd rather pay R1000 to MTN.