Griding noise when driving!?

ive got a ford puma (x reg) last few months ave been hearing a grinding noise when driving! i think its sumthing 2 do with me hittin the kurb and buckling my alloy, :( at 1st it was fine no problems apart from a broke wheel which i changed but a few months on and i can hear a grinding.... its nt the breaks ive checked tht. got new pads and discs not long ago. i recently took it 2 the garage and they had a look charge me a tena for they problems they said theres nothing worn!!!! lol i duno wat to do next..... i mean its just ped its mot 3 days ago but this problem is making me not enjoy driving, any help would b much appreciated thanks