Hallo! Can anyone help here.

I imported a key via mycelium but it didn't display any balance, only giving me addresses with zero balances. I rechecked in blockchain for balance and found it was there until now. I have since contacted mycelium support for assistance but nothing seems to be forthcoming.
Later i learnt that you can import a key that is with mycelium via electrum. I tried this but it doesn't seem to be working still. Is there someone out there who can help me on this?