Vodacom account billing *****

Good day 04/02/2020 I just spoke to Jabulile at 11:15 from Vodacom asking her about my Vodacom account why is it so high than normal , normally I paid R 347 and now the account is currently sitting on R378.99 I ask Jabulile why is the bill high she said I was getting discount, I mean discount of what’s I m paying a contract of 24 month which I signed . The contract must be R347 until it’s end unless I took advance airtime otherwise it’s must remain on R347 not what I m seeing here . This is just ***** we signing for something and we getting something else that is just ***** I m not going to pay that 378 I m not going to pay.