I understand your frustration. That is exactly what my quilting looked like before I got my Pfaff with a built in walking foot. If it is possible, you might want to try taking your problem to the store you bought your machine from. They are usually pretty good at trouble shooting. Even if you didn't buy your machine from the store, problems like this are sometimes seen as a challenge. My other thought is to try loosening the tension on the top thread.
Good luck and let us know if you find a solution.