There is at least one similar report on the US boards, that seller got a message same as yours but they owe $0.00!
As Tyler mentioned if the payment was VERY recent then it just needs time to catch up. If it was more than a few days ago then you will have to call IF your account is actually on hold.

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915
- answering Trolls is voluntary, my policy is not to participate.