Vodacom - wrong information from branch and call centre

Dear Vodacom We have been clients with Vodacom since 1996, and have been Red clients for a number of years now. But I am extremely unhappy about the recent service we received. I received an sms in March stating that I am due for an upgrade. We went to the Mooirivier Vodacom shop, and the lady said that there was only one month left for the old handset payment. I asked her to make absolutely sure, as I could not afford for my account to be more. She assured me again that there was only one month left, after which I upgraded. To my disappointment April also had an extra handset amount, then again May and now AGAIN in June!!!!! This means that my account is nearly DOUBLE the normal amount. I have phoned your customer services a few times, and every time the case will be escalated to a manager to phone us back, but this NEVER happens. I would never have upgraded if I knew this was the case!! So who do I hold responsible the branch or Vodacom?? When I phoned your customer line they also assured me that there are no more payments left? Given the Covid situation, we lost income so what makes you think I can pay for two handsets on one account? Update: you contacted us last Friday, only to let us know the extra handset installment is now finished!! This does not answer my question! We would actually like to be reimbursed for the four months extra we had to pay after the branch and the call centre advised us that there was only one payment left in March, yet we are still paying the extra amount!! Next stop will be the Ombudsman! PLEASE ADVISE