Billed and debited two months in a row

I received a telkom bill for R167 in the post and got debited for it after about speaking to 8 different people at telkom no one could tell me what in for after providing them with the invoice as well their Internal TIN number on this invoice I decided to let it go now I have again just received another bill for R147 which shows due by me for yet another invoice I have two contracts with telkom that goes of monthly I need answers what is this third contract it does not belong to me why am I being debited your call centre staff work for there but are more clueless than myself I will never ever support telkom again or encourage anyone to!