********* business practice

Vodacom did not debit my monthly stop order on the 25 th as per agreement. They went to debit the following month on 13th as they had problems with their computers. They then charged me 100 r more as punishment. My account then had 2 months arrears. I have since paid up and it's up to date. They are refusing to give me another contract as there is a special for Sony which I want. I have been with vodacom for years. I have never skipped a single month. Now they create a problem for me and they don't want me to get another contract. Please help me out here.