Telkom mobile dispute

Telkom is ****, for the last 3 - 4 months i have been getting no statements from Telkom what so ever, I went to Telkom in mall@reds which where they told me I have a R1800 outstanding amount on my account I have being paying every month so far and have n9t skipped one payment, I want to know where my money went because I never got the reverse payments from the bank.