Unauthorised upgrade on contract

As a long standing customer at Vodacom I am extremely disappointed at the lack of willingness to help me with my contract upgrade. Not to mention that I was upgraded with a new 2 year deal to change my price plan which I have not even asked for. My contract was due in 2024 and I called in to upgrade my phone line. I have been calling since October 2024 to inquire why was this done and have been taken from pillar to post. On the the 30th May I was given a reference by Nokukhanya that my account will be credited/refunded between 14 to 21 working days. The 21 days finished on the 27th June and there is still no refund/credit on my account. I called on the 28th June and was promised a refund. I recently received a statement and my account is still charged the router I did not request an upgrade, there is still no refund or credit. Vodacom uses it's power to go into our accounts and debit these amounts *****ulently knowing that if we stop these debit orders our credit record will be affected. I am really frustrated with the poor service from Vodacom and seeking advise - please help!