POOR Service and REFUSE to assist me

I’ve sent an email with bank statements to vodacom because they say my debit order was bounced, I showed them that there was money in the account that it was an error that it bounced as there was money in the account at the time so they took off another R100 for failure to pay then they tried again same day and it went off, they only contacted me at the end of this month to say they double debiting me and taking that R100 off. Even after I sent them the bank statements. They refuse to help me and I’m so glad my contract is ending soon because I will not be upgrading nor use their services again.