AVON ACCOUNT - DISSATISFIED WITH DEALFLOW SERVICE!

My Avon account was handed over to DealFlow. I have been paying them monthly since last year October and then February this year I made arrangements paying via debit order of which I have been paying until now. They have now sent me a letter of demand and calling me for no reason at all. I don't even get my statements and when you whattsapp them they never come back to you. They also charge you for sending you e-mails and calling you of which is very unfair. They are not professional at all.