Unauthorized deductions

I was contacted by vodacom and offered a tablet for R 89 p/m which i agreed to, i then noticed some pecu**** debits coming of my account i.e. Hotspotter R39, Rescue Box R49 and Somu Sim R60, so this tablet is costing R237 p/m. What drives me insane is that i did not give permission for this as at R237 p/m the **** tablet is not worth it, and VODACOM gave my banking details to these people as did not speak to any of them. Now it is one headache after the other to get my money refunded, VODACOM should be charged with *****!!!