******** billing and movement off my account

I have been with Vodacom since 2004 & few years back took out a contract with Autopage using Vodacom as the service provider.In the 4 years my bill have NEVER exceeded R700(being the max) with an average bill of R500pm with ZERO DATA USAGE BILLING IN ALL THESE YEARS.For the month of June as well as my 1st month on maternity leave (therefore no business use whatsoever) I was debited a staggering R1798! My contract had come up for upgrade some time ago which I declined (all calls are recorded) as the package I am on is apparently no longer available (unlimited free data).I called the call centre furious & low & behold I was forcefully moved over to another contract type,without notification,discussion or authorization and have such been billed for data since June.This is clearly unfair business practice and have logged a dispute to which I received a response that it will be dealt with in 2 weeks & a call centre agent was suppose to contact me within the week-its been 2 weeks no resolution or contact & my next bill set to go off in 3 days.Vodacom & Autopage this is unfair practice & unless im contacted and reimbursed I will certainly be seeking action!Simply Disgusted & Dissapointed!