I am super disappointed with MTN.

I am super disappointed with MTN. On the 17th of April, they decided to suspend my number for a reason I am still to be advised of. My phone cannot call anyone, I cannot send messages, I cannot use data, I cannot check my airtime balance either, The best part of it, I cannot even use my number to call them. Their network just tells me that my number cannot be recognised. I have been calling them since to check what was wrong with my number, and they said it had been suspended and it is to take 21 to 30 days to do an investigation on the issue identified. What issue...??? They cannot say. I have lost out on very important phone calls - work, business and a lot of personal calls that are could've meant life or death. I am gravely disappointed with MTN. I have been a loyal MTN subscriber for the longest time, but after this, I have lost all that loyalty. Today is day 29, I hope my number will be activated tomorrow.