Refund, Poor Service, MTN sucks

If I could give MTN zero stars I would, I have been communicating with MTN since 1st week of December, I cancelled my home internet effective immediately and they advised me the refund will be processed. I send an email on 31st December the 2nd the 3rd of January no response, I sent another email on the 6th requesting to speak to management whereby I actually got a response advising the manager will contact me shortly but unfortunately they still have not called, I am waiting now 5 weeks for a small refund and they just dragging the situation, their is no updates nothing . YET MTN is an international company for the life of me I cannot understand this service provided