NHTSA Complaint #11621018 — 2012 MINI COOPER COUNTRYMAN

No warning lights have come on and the car is braking on its own. I try to push the gas and it doesn't want to go. The car has around 42k miles on it. I took it to tom bush mini last week, the said the front axle was leaking some fluid, they ordererd the axle, changed all brake pads, changed the brake fluid and said it was good to go, cost about $2300. Got the car back, doing the same thing. Now they said all calipers need to be replaced and the hydro unit dsc needs to be replaced which will cost around $6400 and they can't get the hyro unit dsc or 2 months. If this was the problem why didn't they know last week? It doesn't seem like the car has enough miles to have such a big issues and no part for 2 months. I don't know what to do.