charging me connection fee that wasnt in the agreement.

I took out two tablet contract specials in December over the phone, on the vodacom store website there was nothing stated about additional sim and connection fee and when i spoke to the lady over the phone she also said that i will only pay the monthly amount that is stated on the website, so now a month later i get an invoice with additional sim and connection charges. i have never had any problems with Vodacom, i have four contracts with them but i think its time to move to a new service provider this is unacceptable!!!