Hard time getting my payment history updated with XDS and they don't answer calls!!

I've logged a dispute with Xds in Jan, there was a misunderstanding between Xds and On Air. I've been listed for missed payments which is incorrect but instead of On Air confirming that I've never missed payments they confirmed my remaining balance on my contract which was not the query. I spoke to Freddy from Xds today and he seems to understand but the call cut off and he never bothered to call back.i tried calling them back and ive been on hold for an hour. What a horrible experience. There's also an agent there by the name of Nicolia Geduld, she's been emailing me back and forth for something so simple and straightforward!! What is the matter!!