disgustiong service

i have a contract with them,boom this yr sm1 frm their call centre changed my bankinging details with out my permission,the bnk they changed to doesnt have money, for 2 months they debited and found no money (bear in my i lost my phone and they only gave me a blacklist form and nothing alse)an i ddnt hv such money to pay at once and they dnt want to make part payments arrangements ,now they have handed me over ...i will try and poay you people once i am done paying you please never ever contact me and i will port to another network, you have ruined my credit record telkom should teach you how to do business