Yes, not good news at all unfortunately, although you did make one sale before testing the water, it could have been worse!
Always smart to dip your own toe in the water when dealing with a third party in this area, and has Planes has suggested, establishing good open communication.
Before I do business with any webiste there are two things I always check first;
1. Ensure there is another means of contact other than just email. Two problems with email only contact, emails don't always end up where they are supposed to, and they can easily be ignored by some when the going gets a little rough!
If you have an issue you need to resolve you really need to ensure there is access to effective open communication.
2. Test the response of the customer service using all the contact methods to pose questions.
If they are slow to respond regarding a potential sale, you can imagine how slow they will be to respond when there is an issue you are trying to resolve!
As planes has suggested above, would be great if you could leave that feedback in the suppliers profile, that will serve notice to all future members thinking of using the service.