Billing errors

Telkom SA have billed me for a contract that i canceled in may. The store consultant failed to honor the agreement and i was billed twice in July. i was also reassured by the store manager that all is done to my surprise i was billed again at this time for canceling a contract that was i messed up by the store consultant in Eastgate entrance 4. They not helpful at all All i want is my money back that's all If i could give a negative star i would