MTN service extremely bad

I recently did a online upgrade and they upgraded me to the wrong package. I spent 2 days trying to get this fixed talking to +/- 15 people at MTN with all of them just transferring me to the next consultant.

Eventually I was recommended to the right department but they dont take calls so I must send a mail to ask them to stop this process.

For me this is unacceptable as they made the error and now I am the one who needs to call and mail people to get this sorted with no one willing to help.