iTunes match has lost a couple of my albums, tried all the support tips and they are still missing.

I went to listen to a couple of albums that ive bought from the ITunes store and they are missing, however another album from the same artist is still there.

its about 10-15 albums are missing. i cant remember them all so it could be more. ive got around 3,500 songs on my itunes. all of them bought with itunes so i find it really derpressing that ive lost this much content.

please help, ive tried all the itunes match updates and blah blah and it doesnt help.