poor service from vodacom

good day

i have phoned vodacom more than ones and still i don`t get an answer from you,i have upgrade my contract and received the phone on 12/04/2019. as confirmed with the agent on the phone i need to pay an upgrade fee of R150 and i have paid the R150 by debit order, but now vodacom have deducted double premiums and no one can tell me why you have deducted more on my contract.my first payment for the phone was on the 30/04/2019 you deducted R150 for upgrade fee,R99 for driven and R103.99 for vodacom, the 30/05/2019 you deducted R99 for driven and R278.09 for vodacom. the 28/06/2019 you deducted R99.00 for driven and R106 for vodacom. my contract that you confirmed over the phone should be R99 per month. i also have sent numbers of emails and still no confirm why you deduct more than R99 per month. i upgrated with a hisense infinity E6, please can a manager contact me and give me an answer as soon as possible, as i am tired of vodacom`s poor service.