No Car for 4 weeks.

Bought my BMW F30 from Car connexion in East London 4 Weeks ago. Had the car for 4 days and took it back as it had a gearbox oil leak. The mechanic that day told us he is not familiar with BMW's. So he already decided he is not working on it then and there. So they sub contracted the car to BMW then from there to EC turbos which stood there for a week. Then from there subcontracted it to Mayfair gearbox who didn't even have a look at the car and diagnosed the completely wrong! Even wanted to fiddle with he engine.(third week without my car due to incompetence all round.) yesterday the 6th of April they were on their way to drop off the car and something went wrong took the car back to their own workshop. Today I ask what's the next step to be told I won't have the car by the weekend the 4th weekend without my car. Who in their right mind would be ok without their car going on the 4th week? You would think after so long the car would be number one priority! I am on anxiety medication and booked off for the rest of the week because these people are going round in circles. They actually don't realize or couldn't care how I feel. Keep offering me to cancel the deal which is serious lly ridiculous and NOT an option. I emailed MFC today to deal with this nonsense as I don't know what else to do I was patient for so long but I've reached the end. I cannot understand how you have a workshop but subcontract the car to 100 different places. 4 weeks without my car? How is that even possible. It's heartbreaking. Not good service at all.