Serious problems

[X5Andrew]

Ok so I have an 01 x5 3.0 went into the shop with the vanos noise issue. Purchased a new vanos and upgraded the seals. The mechanic put it in with all the proper tools but the noise is still there. He said one of the valves might have bent because when he did it the timing didn't line up and the chain might have skipped. He said easier to change the motor then fix... any thoughts, sound right?
Also, he said he is guessing that is what it is, on Friday he said chain guides and now says he isn't sure and prob the motor. I was wondering if it was oil pressure, he said he didn't check that, but said it would trigger a light and or throw a code.

Kinda lost as what to do with this, and if I should even pay him for misdiagnosing the problem.