Lack of communication with Netstar with clients

I have a contract with Netstar. I did not realise my monthly debit orders were rejected due to closure of my FNB account. My account was in arrears for approximately 3 months. Instead of Netstar contacting me with my arrear accounts I received call from Netstar Debt collectors that my account was handed over to Nimble Debt Collectors. Very unprofessional of Netstar