Telkom is destroying my life and reputation

Telkom and mondo are working together to con people's money they sold me a contract for R159 but they have been debiting more than we've agreed on to show that I've been conned they wont give me my sales call when i phone Telkom for help they tell me to call mondo when i call mondo they tell me to call Telkom I've on their back since may 2018 my credit score its bad now cause of them I'm loosing business cause of this issue please help me from R679 to more than 2500 please help me please guys dont be fooled I'm not alone whose complaining go into Telkom stores ull see this guys are *****