No after service

What an absolute useless company! We joined Sage One Cloud on 27 March 2019, we paid for one year subscription once off. Our company was invoiced twice for a year's subscription in March 2019. I sent an email to the accounts department on 11 April 2019 to inform them of this duplicate invoice and received an email stating that they received my email and I will get feedback. I never got any feedback from them just statements still showing my payment and the duplicate invoices. Then on 16 July 2019 they lock out account because some brite spark finally picked up the duplicate invoice and deleted the invoice that was linked to the payment we made. So now only one invoice shows on our statement no payment or credit note is on this statement. I phoned the finance department which tells me everything is sorted out with my account they just waiting for the credit note to be posted. When I tell the consultant that I cant access our account she puts me through to the support team which puts me through to renewals team and so we go one from one person to the other. And to date it is still not fixed I have sent emails and got referemce number and stating someone will get back to me in a few hours that was on 18 July 2019 and I'm still waiting. Reference numbers IR*** IR*** They are useless NO AFTER SERVICE WHAT SO EVER. I want a refund for the remaining 8 months of subscription we have paid for and for the mo th of July as we couldn't quote or invoice customers we had to use EXCEL thank you MICROSOFT for not bringing our business to a stand still! And this from an accounting software company I will not recommend them at all!!!!