Irritated with sage service within only 2 months

I have signed up for Sage Express in April 2019. The monthly payable amount was +-499. The sales consultant informed me that they had a special running and the first deduction will only be in June. Therefore no deductions in May. In May they did deduct the first payment. After mails back and forth with the sales consultant, the money was still not refunded after she acknowledged that there was a mistake on their side. The finance department at sage is super *********** only knows to setup debit orders.