Trying to Close an account

I have tried repeatedly to get MTN to give me an amount to settle an existing account. Account number/Mobile number: ***. For 3 weeks now someone will call me from Cancellations / Retentions. Emailing does not seem to help. No one can put me through to Cancellations as everyone is on strike. No one responds to emails. I have posted on Facebook - MTN does not seem to care. So now they are not only going to lose my sons account *** - they are going to lose mine as well. I think I will call Cell C and migrate over to them. Almost 18 years of my contract being with MTN and they are as about as useless as any company with a service offering can be.