Call centre doesn't answer calls and failed debit

Hi,<br> <br> I have an account that has been handed over to this credit collection company. <br> <br> Number 1: They call me after hours<br> Number 2: I make a payment arrangement with them and then they do not debit the amount agreed upon and send me sms's saying I have not honored my arrangement and this shall increase in interest, *******! (I have more than the required amount in my bank account)<br> Number 3: I email them and call and get no response. <br> Number 4: When I call all 3 numbers listed for them they do not answer or they do and put the phone down on me. <br> <br> Please respond to my email! I am very angry and frustrated and I will take this further if receive no response in due time.