Unauthorised payment and transaction

Hi

Vodacom do not want to Migrate my contract back to the package I signed up .I took a contract for 650 mb 50 min top up for R498. And they did unauthorised migration on *** that is 2.6gb100min that I did not agreed on and the is still 50 minutes monthly recurring i did not authorised .I called customer care to flag my account due to all of these activities were going on to my acc without my authorasation as i was advised by customer care. Now they say the can not reverse unauthorised migration of 26GB 100 MIN which i never asked for .I want my contract as I took it at the 1st place that is 650mb 50min .They need to do it while there is ***** flag because if i unflag my acc they will do another ***** on my acc without my authorisation .I have been through a lot and I want Vodacom to payback all my money the 've been taking for unauthorised Migration and additional Vas they've been adding all the previous months i want my money to be paid back to me .