Non responsive and non existent after sales service

Absolute worst customer experience I've ever had. After taking delivery of a vehicle I was told the papers and spare key are not available. I was told it would be couriered to me to which I agreed. A week has passed and still nothing. The problem is that you cannot get hold of the sales person he ignores your calls. You send him WhatsApp after WhatsApp no response. I got the managers number same thing! Just doesn't answer his cellphone I'm told he doesn't have a landline. Got hold of him after numerous attempts he said he will call me back he is just busy. Till today never returned my call or is answering my calls. Got hold of the salesman yesterday finally he says the courier will be at my place around 2pm. Nothing arrived. Called him today after numerous attempts got through via the reception he says no they only collected it today. I didn't believe him and asked him to send me the tracking number and he agreed. Guess what he didn't bother to send it. I don't know what to do or who to speak to to have this simple issue resolved. Safe to say I will never do business with this dealership again and I will make sure to warn people about the service levels. I need to get this vehicle registered for business and they are literally making me lose money with their don't care non responsive attitude.