Extremely poor customer service

I've received to devices that I've never ordered from Telkom marketing agency, Mondo. Well I took an initiative and exhausted my resources and sent the devices back. It took quite sometime for those devices to be delivered to them and had the contract active in the mean time and had my bank debited. Well since I didn't have money for this contract I had no choice but to reverse the my hard earned money back. To cut the short Mondo confirmed receipt of their devices and also sent confirmation to Telkoms cancellations department. I made numerous follow ups to a point where I feel that this matter is being handled very carelessly. It takes forever to cancel this contract and it affects me very badly. The only response i get is that the person responsible for my case will get back to me about the outcome but for how long do I have to wait for the person to get back to me? This affects me because prior the arrival of those devices I had a sim contract and I assume that billing of two devices was combined with the sim contract and i reversed everything and hence have my sim mobile suspended. I need to have this two devices contract cancelled asap so i can have my sim contract restored.