exorbitant charges,unwilling to rectify problem

I have posted a complaint before regarding this issue because i was being charged (r381.20)for a purchase agreement i have no information of,after i posted the first complaint i was contacted by a teleoperator who knew nothing about my contract,she told me the same things i was promised when i took out the contract and did not even know about the problem.I recently received my knew bill with an exorbitant charge of R8500 for another purchase agreement i have no knowledge of,i logged this complaint at the telkom mobile store twice and twice through the call centre but have not received any response,very disappointed and tired of getting no feedback.telkom mobile is giving us the same poor service we have been receiving from telkom.