Dishonest Telemarkets Sales

I was contacted by their telemarket sales and informed that I'm spending to much per month but if I migrate from a Smart S top up to a Smart M Top Up I will get more minutes, airtime and data and pay less. First invoice my account is almost R200 more, phoned numerous times and sent from pillar to post and no-one can help me. Vodacom does not call back, and everytime I call I have to tell the entire story to a new consultant who in the end points me to someone else. it has been 3 months and the issue has still not been resolved. I want my old package back without paying migration costs as Vodacom **** to me. I have been with Vodacom over 15 years and this is the utmost ********** service ever!!