Pathetic service

WeBuyCars Midstream is the worst when it comes to customer service. I traded in my vehicle on 4 August 2022. My vehicle that I traded in had a valid car disk. The vehicle I bought from had from them had a disk that expired in April 2022 based on the their promise from the Salesman that I would get the registration documents within a week or two at most. It's now 4 weeks later and I'm still driving around with no valid car disk or registration documents confirming that I own the car. Everytime we try to contact the Salesman, Anton he answers with arrogance that's it's not his problem and that we must wait for an sms from them to collect the registration documents and disk, all the while my wife and I are driving around for a month now with a car that doesn't have a valid disk.