account hended over

i have a woolworths account and i have not paid in well all the time mbd credit calls me and my director picks up the call they are always nasty with him i went to hearing because of that

i know i am suppose to pay my accounts but i always ask them to call me on my mobile not during working hours as i am not suppose to answer my calls now they call me 3 times a day on the office number i dont appreciate that at all i will loose my job because of their attaitude it is getting out of had now