Telkom bad service

Hi all, I'm in a situation I have a WiFi contract with Telkom 40gigs day 40gigs night I pay R199 for this.This month I paid R469 for the deal. I went to Vangate Mall to query this to why I'm paying so much,the consultant tell me my line is an open line and my limit is R500 and they charge me out of bundle rates ? How did you make those changes with out my consent ? I went to N1 city consultant tells me they cannot help me I must call billing department. Still my issue is not sorted. Telkom is bunch of ******* with now propper process for a solution to your problem, they give you the run around until you need to come to this platform wich is not fair on customers! Assist me with my problem please.