********** service fees that were never communicated

I got an sms about outstanding funds which doesnt make any sense. Then I got a call from one of your agents that I owe service fees. First of all I called before I made a payment advance and enquire on how much I should pay. Then I get this nonsense?? This shouldn't be my problem. I was never told about any service fees,then you have a rotten nerve to want to give me a payment arrangement. Fix your ****, check my complaints and queries before I made this advance payment then get back to me. I'm not your fool