Pathetic accounts department!

I have phoned endlessly for a month, spoken to various different people, sending email requests, follow ups and written complaints without any feedback. I have an error on my account that I requested to be corrected end of February 2019 - to date nothing has been done. You cannot phone accounts department directly and you hold for ages before anyone answers. Sage actually owes me money! This really does not make me a proud Sage Accounting Advisor - how do you promote something to your clients when support, service and accounts are at such a low standard?