Absolutely the poorest service every!!!

I have been batteling for 6 months now for telkom to correct my billing. I took out a data contract on the 2de January for R99, they have been billing me R365 a month since January up to now. I have been in the shop 4 times, send many emails to the billing department. I have about 8 ref nr. Every month my issues show that it has been resolved but in fact i am still sitting with incorrect billing charges. I am so tired and i dont know what to do anymore. Telkom owes me so much money. They can take your money... But you have to battle to get it back. Any advice before i loose my mind.