Vodacom fails yet again!!!!

My fibre line at home was down for 15 days from 01 - 15 November 2021. I paid the full invoice at the end of the month. December I am told that Vodacom has processed a discount for the downtime I experienced yet my monthly payment is higher that when I did not have the discount....How in the world is that even possible, But then again, its Vodacom, what was I expecting. I cannot wait for my contract to come to an end, I am definitely cancelling this contract.