MYOB Subscriptions

I too have  had a billing error for the last 4 months and am being charged for  a subscription that comes free with my Practice. Despite multiple calls, multiple emails and promises of it being sorted I am still  receiving an invoice each month which has now amounted to a total of nearly $600. I had had to keep a trail of emails, names and call logs to be able to prove my case .. This in my opinion is completely unacceptable and I too,am ready to take my business and go  to XERO, on which i also have clients and find that issues like this do simply not occur ..I would welcome a  response .