Wrongfully billed

Well Telkom has been ******** me big time, my account is up to date but this month i was billed twice, R199 and R398. When i asked their consultant they say the R398 was from december 2017, but i never skipped paying in december. They asked for my bank statements from last year and i provided them with it but even now the issue has not been fixed. To make things worse that R398 is still reflecting in my accouts which is frustrating for me. I think someone at telkom is just doing ***** or something on me because i cant explain what is happening. I need answers.