Very disappointed with Vodacom’s service

Very disappointed with Vodacom’s service. Last year I agreed telephonically to a month-to-month data increase because I was using too much data. Now I am suddenly being told I have a contract running until next year January, despite my handset already being almost 4 years old. I never knowingly signed a new long-term contract and have requested proof of this alleged agreement. To make matters worse, my account was fully paid up and I still experienced service/data issues while paying nearly R1,000 per month. Extremely frustrating experience and very poor customer service.