Vodacom makes me sick

We told Vodacom directly that they must debit our account last day of the month there is a reason for that, because some of our salaries that has not have a fixed date even tho end of the month is tomorrow, now you guys debit our account today?????? And my salary is not even in yet??,you are going to charge a debit fee and you leave my bank account in arrears because you debit when you want im not going to pay n ekstra fee im sorry then you can cancel my contract... And i can not understand why you guys cant debit on a sunday if al the othe cell phone networks... Im very un happy now i have to pay 80 service fees with my bank and you are going to charge me an ekstra fee because the debit order declined you make me sick and im fed up with you guys and another thing you said i will pay a fixed amount of R299 for my contract and now its R305??? Please explain and im not going to leave this here