Who Me Too'd this topic

Hello I have recently found a song then gone to save into my Spotify acount (as I do all the time) going back onto "my music" nothing was there but the song I downloaded. I went to search for other songs I had previously saved and they were no longer on there. Said I need to re download them. So all my music had gone. Just wondering if you can sort this? Save me re down loading it all. I don't quite understand what I pay for as a service I thought I paid for my music to be there 24/7 and be offline. Wasn't impressed that it removed all music I put on took my 3 months to build up my music libray to have it vanish in a second. Any help would be useful?