bad service

i have been charged for two routers which one i am not aware of, first they delivered another router which i returned now i am being charged for it, i have sent numerous emails requesting for this to be removed from my invoice instead they say they will get back to me then i receive another invoice with the same router appearing on my invoice for the number ********** 017 it is now affecting payment of my other router, worse part you wouldnt even know where to contact telkom to get efficient service , id number ********** 924084 cell no ********** 440 i hope this will be resolved soonest before you lose more clients