Cupra Leasing only problems resignation

Hello guys, I hope someone has already been able to have a similar experience and can help me now. I currently have a Cupra Formentor VZ. The leasing contract goes a total of 48 months. The car is currently exactly 1 year in my possession. Since August the car is permanently causing problems.. all error message that comes on the while driving. I had to wait 6 weeks for an appointment with my dealer. At the workshop appointment I was told that the engine control unit def ect would be and it could be that it takes up to 3 months for a new one to arrive. I was shocked because I had a Seat Ibiza as a rental car. I was not pleased of course and thought that I would not pay so much money for an Ibiza during such a long waiting time. Then the colleague from the dealer said that I should be glad that I am mobile. Then I thought great customer service. With a little whimsical I then got an Audi Q3. Also not the same equipment but I d Take better care of me than Ibiza. 3 days later, once again my car was finished, I was told that it would go faster. When I was driving, I noticed that my cruise control was forgotten to switch off. Of course, there is hardly anyone there who had to drive and clarify it. I got an appointment again in 6 weeks.. I was a little angry but only thought that I could drive without cruise control. After a week, the same error messages came back. I got back back and car again. As a rental car this time a VW T-Roc. 3 days later I got the car again that was on Monday afternoon. Tuesday morning came again the same error on the way to work. After work again to the dealer there came the error 4 times in a row. Now the car is in the workshop and maybe I get it again on Friday. Current rental car Seat Arona. I like to withdraw from the leasing contract because the car is very uncertain and with these error messages in the notmod I said that yesterday to my dealer and they only said that they can pass it on to Cupra but rather that it will be fixed and I have to accept it… Had someone a similar case because I just want to get rid of the car it only costs annoyance, time and money. Of course nothing comes from the dealer. No excuse or reduction or anything. I pay a lot of money for a car that in the last 3 weeks is almost only in the workshop.