I need help from Qtum team.

I have lost my 100 Qtum funds in my wallet. It doesn't show that address anymore and hence doesnt show my balance.

On November 16, I purchased 100 Qtum via Bittrex and transferred them to my newly created qtum wallet on Android. I used the address the app generated, to get the funds. The funds did arrive in the app wallet and it showed the transaction in the app itself.
I backed up the passphrase and everything.

Yesterday, I opened the app, but now the app doesn't show that address and neither the balance as well, nor the transaction. It shows a completely new address and no past transactions.

I check the explorer: the balance is still in that wallet.

I also tried re-installing the app, and using the 12 word passphrase to restore the wallet, but that old address and balance is gone.

I tried emailing them as well, but haven't received a reply.

I am very disappointed because I did everything by the book, by copying the passphrase and address etc. The transaction was also visible in the wallet after I had received the funds from Bittrex.