Can I have my car back and fixed please

I bought a car (Volvo) from the Kia Dealerhip in Cresta last year Dec(2019). When I went to collect the car and I was about to drive out, I realized that the radio is not turning on, the screen in black and not switch on. I immediately told the guy who sold it to me (Nivash) and he apologized and said he was not aware of that. I fetched the Car Saturday and he said I can bring it back Monday its probably a fuse issue. Came Monday I had to call him, and took my car back by force and still they did not help they said the factory where they have to order the fuse has closed and will open next year in Jan. Come the following month, Jan the 6th, I had to follow up with Nivash and he told me he will let me know when to bring the car. I finally took the car to him on the 14th of Jan and it was booked for following day at 8am for the fuse to be fixed and I was supposed to collect my car on Friday (17th of Jan). Cam 17th, I called Nivash, he did not pick up my calls nor respond to my emails. I ended up going to their garage and I was told to come Monday. Come Monday, the guy was on leave and blocked my calls and everything.I went to the garage and spoke to a lady who promised to take over my case and assist me and told me the car will be ready by Thursday (23rd of Jan), she took all my details and promised to keep me up to date. Came Thursday, no call from her. On Saturday(25 of Jan), I went back to the garage, she did not even talk to me, she took me straight to Nivash's manager, who apologized and said they let him aware of the situation he forgot to call me. The garage they had taken the car to, said its the whole radio and not just the fuse so they have taken the car to Volvo to be fixed, he will call me Monday( 27 of Jan)to let me know what going on. Monday, I received no call until today. Nivash started sending me text on whatsapp saying the radio has been ordered and will be delivered by Tuesday (4th of Feb). I have been calling and following up and no1 is giving me a straight answer. I asked him to take me to where my car is, I will take it and bring it back when the radio has arrived, he said unfortunately I can not take the car as it has been opened. My issue is that, there is a possibility that the problem was not just the radio hence they are taking long to get it fixed. Another issue I have, I am paying the bank for a car that am not even driving and I do not have. What if when they bring it back they would have caused me damage to it and it will start breaking down. I feel like these people are taking advantage of me cause am a woman. Its almost a month now with no car but am paying monthly installment for it.