So frustrating for such a Big company

So dissapointed that MTN it is using Afrizon to **** peoples, I have been writing emails to them and they are responding to the emails therefore they are busy kept on sending me sms even after I have told them several times that Afrizon did not deliver the home WiFi And I even manage to go to Afrizon offices in Wynberg Sandton they said on their side my acc it is zero and they showed me on their system but still my number remain. suspended by MTN and this morning I have received another sms that if I don't pay they are going suspend it for good I really don't know what to do