Dimension Data - Terrible customer service

As per the request of Dimension Data, we had to cancel our Microsoft subscriptions, as they were to discontinue this service. After cancellation they were supposed to refund us for they remaining period. According to Dimension Data the refund would have been paid within a week or two. It has now been over a month and no refund was received. We have sent numerous emails to try to find out when the refund will paid, but no response. In my experience Dimension Data has the worst customer service I have come across on a long time