Bad service

I have a contract with vodacom , I had changed my banking details and I contacted to to update my banking details and they deduction did go through when I check in that month which was October 2020. After that they had decided not to deduct , right now my services are not active because they had to tell me I missed payments just because of someone who failed to do they job now I have to suffer and this went to my credit score as missing payments , I have been with vodacom for more than 6 years and I have never missed payments ! Can this be fixed with an immediate effect I’m even writing my exams and I don’t have data because of vodacom fail to do their job .