How can I fix my MP3/MP4 TELEFUNKEN?

My husband purchased my mp for my birthday Feb this year. For about 2 months it is just dead. As in, not wanting to charge, screen completely off and dead. I have lots of memories and nistolgic music on there and I have no idea how I am going to fix it. Is there a possibility that the files can somehow be retrieved since the disc I got with it can't even be read on my pc. Do I give up? Or is there hope? PLEASE help if you can...