NO service and simswap not done as promised

My phone was ****** on the 10th after struggling to get through to a consultant that was willing to help, I was told that my phone cannot be blocked as I must have the IMEI number and MTN cannot even provide the simple service of locking a line. Then I had to further struggle for 3 and a half hours to get a sim swap done in that time the ******** used my airtime. Once I had the IMEI number, the consultant tells me I must go to an MTN shop as they can't help. That was the worst service I've ever had. To make matters worse, after waiting more than the 24 hours, I found the sim swap was not performed on the simcard as I requested and the call center is not available when I am calling to query what happened. I am so utterly annoyed and disgusted with the non delivery of service it is beyond words. Who is going to replace my losses if they gain access to my bank accounts, my work details ect...? After this episode of complete NON delivery of service, I am seriously considering of changing my cellular provider. Please do assist in a human fashion and return to me my number, that's all I ask