Worst service ever - online and call centre

In January I upgraded my data line via the online option - system erroneously upgraded my main phone line. Returned the equipment in Febr and requested full reversal of the upgrade. After numerous phone calls, the reversal was only processed on 08/06/2023, and the difference in package premiums credited. However, shortly thereafter I got billed for the equipment, which was returned over 6 months ago! Have made numerous calls where I just get told that I need to wait as I will receive a new bill. Spoke to them again on 21/06 and was informed that they will escalate the credit request. Just received an sms informing me that I will be debited for the equipment balance this month. So nothing has been done. I have NEVER in my >20 years relationship with Vodacom been so disappointed. If that debit comes off my account end of the month, it will wreck my entire budget, putting me in debt on other accounts.... FIX YOUR ERRORS!