Poor service

I'm frustrated by vodacom collection department. I have a contract with this network for a data only sim and phone that debit every month on the 18th. On the same date September 2019 a debit of R511 went off from my account but I got a message stating that the account is in arrears on the 22/09/19. When I called *** I was advised to email my statement to *** which I did on 25th. I didn't get any response as it was promised that I would be called in 3 to 7 working days. After 7 days I still get sms that I need to make a payment within 5 days otherwise my line will be suspended. I reached out to vodacom and I was advised to send my bank statement that shows that the R511 was paid to them. I did that and was told that the matter will be resolved in 7 to 14 days. Still I receive sms and automated calls to make payment day in day out. I just can't wait to get out of the contract so that I can have my peace. Very disappointed with the network since I have been getting contract with them since 2011 but this experience makes me think twice. Wouldn't recommend anyone to be contracted to them. Very very disappointed that I should make a double payment in a month