I would like to cancel the contract

<p>Everything was fine until I changed my banking details, and then took another phone with Telkom. Now I'm a bad payer . I changed my banking details and called Telkom to advise them, the lady that assisted me said it will be effective from the following month, so i arranged to make a manual payment, which i did. Telkom still still debited my account and I requested a refund, which was made into my account, the following month, they did not debit my account, i don't know why, the next month they debited , fine. the third month i received a huge bill and noted that the refund has been added to my invoice, logged an enquiry and was told all this technical terms which i did not understand, and the insurance amount was different from the amount that i was advised when i took the contract, when I asked i was told it is for 2 months, fine. this month I received an invoice , and insurance is still not what we agreed on, when i called the call centre i was advised that i need to call the insurance department, using my airtime to query, which i dont understand as i took insurance with telkom and now i'm being refered to a third party company,but they are invoicing me for the amount. it's been more than 30 days since i took this insurance policy and i still have not received policy documents, i don't even know the terms and conditions of the policy, i'm now disconnected, i don't understand as telkom have my banking details, everything is just mixed up and i must say that i'm being treated like a *****, i have been a good customer and have been paying my bill every month without any mistake, What is going on. Now I would like to know how do i cancel this contract and give back the phone and move on with my life, because it seems like the problems can't be solved.</p>