Hi David....welcome to the Forum
I would definitely call in an independent vehicle inspector to investigate the car.
First thing that rings alarm bells is that you say it started off pulling to one side and then got progressively worse, can't see how that is possible if it is damaged components that are the cause.
If it was a sudden failure of a suspension component and as it worked loose or similar then that would make sense.
It sounds like a cover up to me, I'm sure there is a recent thread on here about the electric power steering column or motor failing which could cause the same symptoms and also it is a manufacturer fault that they are not owning up to (wrong type of bolts used).
Let us know how you get on with it