Please help!

My freel2 ( 2008 mileage 117.000 km )recently had a clutch problem (clutch pedal got stuck right down) and both pumps were changed by local land rover dealers. Further to that and since I got car back a strange blurring purr sound came about especially when driving at low revs. Took car back to dealers and they came up with an air vent solution. So we changed an air vent too!!! Went back got car but when car was cold no sound was evidenced. By the time I got home the same noise started again. I called them and they said they don't know what the noise is and where it's coming from. I told them that the noise started since they changed the clutch pumps. They said bring car back and we will look into it again. This saga has been going on since last July ! Can anyone in here shed some light .?

Thank you in anticipation