Pathetic Service - Debit Order and Zero Assistance

Last Year (20/10/2023) I did an early upgrade and I was told that the outstanding amount is R350 and my new contract is R254.99. I then made a payment of the difference and sent a POP. To my surprise, Month end a debit order of R324.99, Okay I did not mind, but then the same installment every month. On 11 January I called Vodacom and explained and the lady said they will sort it out and I will be contacted so we can sort this out. Today again same amount of installment!!! I called and the service was poor, the lady could not even assist me that she hang up on me.. I am so frustrated and not happy about the service!!!! I need this sorted out