Short story.
Long time MYCELIUM user, same wallet for 8+ months
Overnight I login and find a strange new public key which I don't recognise.
I also see that my entire phone book has been deleted.
My original wallet still shows up as a secondary and the balance is correct but I have no private key associated and I do not know what to do.

I'm going to get burnt for saying I can't remember if I followed proper backup protocol with my wallet when I first started using it, so I don't have any private keys or passwords backup up :-)
At the time. I stupidly found all the bitcoin jargon too hard to follow and since my wallet was carrying amounts so small not to be concerned I did not pay proper attention.

Can anyone assist me in any way - I will pay generously
I ran in to a few sites that claim to be able to recover your key/password but I am dubious.

Thanks in advance to anyone who can suggest something easy enough for a tech noob like me to try, alternatively I'm happy to pay someone to help