Unouthorized amount for handset on our account since May 2018, issue not resolved!!!

Good day From the 5th of May 2018 there appeared an amount of R1500 excl VAT on our Data line (only for SMS's on our alarm) We went to the nearest Vodacom shop and the manager escalated our problem to Vodacom and saw that we indeed never requested a handset. He got the reference number INC ********** 77606-p2 and followed up on the 6th of May after his system said the problem was resolved and a credit note created. Needless to say, the amount appeared on our account again and the amount was taken via Debit order again on the 6th of June!! We went to the shop on the 6th of June immediately and he (given from Wonderboom Junction Vodashop) escalated the problem again online, I also phoned Vodacom again when i got home and spoke to Bonelo from the call centre who was very helpful and promised that it will be sorted out. He indeed even got back to me yesterday saying that the date for action taking shows the 15th of this month (today). We got an sms stating that the amount that will be deducted on the 6th of July stayed exactly the same, which means that Vodacom has ****** over a R3000 rands from us and plans to ***** another R1500 excl VAT on the 6th of July! How are we going to get this sorted out and the money returned, every call centre person and the manager of the Vodashop in Wonderboom Junction agrees that the amount is on the account wrongly as we did not take a handset during may!! It looks that the only people doing their jobs are those in the calls centres and the ones working in finance just don't do their job. Please help