Bad Customer Service

I always have a problem with vodacom customer service, i received my salary on friday vodacom didn't deduct then on saturday i called their customer care the told me they will deduct on the 3rd because 30th its on a weekend, iur agreement for debit order date its the last day if the month, now they've already charged me R100 for bounced debit order i had money in my account on friday its not my problem i cn't pay R100 for something which its not my fault.i also wanna cancel the new contract that i just did with them vodacom has a bad customer service.