Pathetic service to customers...

I have an account with you guys for over 7 years and my account is always paid. Yesterday you guys discounted my services without a warning or message or anything, according to you guys fnb duplicated a payment so I was in credit in February then reversed it. How is that my fault. Is this treating customers fairly????? No warning...not a chance to have a look at my statements and defend myself...we pay alot of money to u guys and this customer service is pathetic.