1.6 Polo tdi 2011 year model

I bought a car on september last year and in a week it gave me a problem.then i reported the problem and they advised me to take it somewhere here in east london. And the place saw that the car has rust in diesel pump and injectors are failing. The dealer said to those people they should clean it and give it to me then it was cleaned. I drove it for a Month and the problem came back and they took it back to them on October to fix it in North West and it came back on Feb.Then it was having an engine light when it came back then in 3 days it showed me glow plug again thats when i gave them a call and sent them a video of it..they said i must drive it longer it will be fine then on the 2nd of May when i was coming from gauteng the car stoped just cut off and they said its not their fault i must fix my car using warranty.. and the warranty doesn't cover some things that are the problem on the car.. now i tried to use the bank that financed the car to speak with a dealer but its not helping because they cut off their phones when they know the call is about my car..now am paying for the car that is not running.