Extremely poor service

I paid my contract on the Vodacom app on 23rd of December 2022, as we received our Salary earlier than usual, which is not uncommon. I did not notify Vodacom as I this was not the first time, I paid earlier then my debit order date and there were no issues before. My Debit Order still went off on the 28th of December 2022 and when I called and checked my bank statement, both amounts reflected on the 28th of December 2023. I called to get a refund and was advised it will take 15 days. After the 15 days I called back and was advised that the process takes 15 working days and not calendar days. Yesterday (18th of January 2023) and were informed that the query was still open and need to be escalated and was promised a call back with an update. I received a call now and was advised that my query was escalated further to back office and now it will take another 7 days to receive my refund. I have my contract for more than 10 years with Vodacom and is due an upgrade this month. I am seriously contemplating the type of service I received. If you are Value your customers than this refund will be done within 24 hours and I expect a call from a manager in the Business and not from someone that was outsourced.