I tried to purchase bitbills through the MyBitcoin merchant service. Followed the instructions precisely, but got a message saying "Payment failed". BTC was sent, merchat didn't get the BTC or confirmation and MyBitcoin doesn't reply to support messages.
Did you pay using the "Pay with Bitcoin" button or with the "Pay With a MyBitcoin Account" button?
If you used the "Pay with Bitcoin" option and sent bitcoins then does the transaction show up in:
If not, is it a low priority transaction stuck waiting for a miner to include it?
Did you get the dispute resolved?
The MyBitcoin service does have a messaging system. Have you tried that yet?