Homechoice do not debit account as per mandate

Homechoice hasn't been debiting my account now my account is in arrears and it's affecting my credit score. One of their consultants **** and put the blame on my bank. Only to find out today that the problem is with Homechoice and they didn't communicate this with clients to make alternative arrangements. They keep on harassing me with calls everyday. I will be settling my account and parting ways with them. They've lost me as a customer.