Lack of Response to Accounting Queries with SAGE

Sage used to be renowned for their support but no longer the case. I use their online payroll system and have had my access stopped due to non payment of a January 23 invoice. I PAID this invoice on the 5th February 2023. I have emailed them the proof of payment several times - I used the account number and the invoice number as a referene for the payment. I have phoned them, but still no access. I would rather use a desk top version than go through this sort of nonsense.