Double Debit Order and poor service

MTN had a system issue for debit orders going off on the 28th of February.On the 1st of March my phone stopped working, I called an agent and requested that they debit me,and when my phone was still not working I called another agent who told me i needed to go inside a store..I went to an MTN store in Hyde Park and they told me their systems were down and now MTN has debited my account twice!! I have called 4 agents and have not received help and now they are telling me it is a process to get my money back. MTN South Africa has the worst service and is extremely ***********. They had systems issues but somehow it has become my issue