MTN blocked my phone, wont fix it and Im left with the bill

I have 2 handsets on the contract that I am currently paying for. One of these handsets was lost on 14th November 2023 and I called in to report it whilst at work. Customer Services Agents insisted they could not blacklist without the IMEI number. I called back after work and requested the blacklisting with the IMEI number. The agent blocked the wrong device and not the ****** one. Since then I have not been able to make or receive calls or sms's and I have been to the MTN store 4 times, they tried re-blacklisting and unblacklisting again and the problem still persists. Yet they have debited their payment on time even though I have had no service for almost 3 weeks due to their mistake. I have been a loyal customer without failure to pay for 6 years and this is the kind of service received. I need to return to store tomorrow again and will probably be told again, MTN cannot give me a turnaround time for fixing THEIR mistake