Debiting money from my account with no conformation

I used be be satisfied with Vodacom for year now.

A few months ago I received a call from them to upgrade my data bundles. They only mentioned that I will be paying less for my data monthly.

When they debited my account this month it was more than double the amount that I usually pay and they debited money from my account not telling me what I will pay for.

Please make a note on your system to never call me again for any sales related services. I feel it is ********* to not mention any charges that you will debit from someones account.

I logged an request, and had to speak to 3 different people to find out what you billed me for. Reference number is: 003S~SCR4