[SVXer95]

Most likely the bearing was repaired improperly. If the hub was damaged it will cause the bearing to fail quite quickly when replaced. The wheel bearings are quite finicky with these cars and will fail if the procedure is not done properly. The bearings are shipped in a grease that is merely a rust preventative and not suitable for use on the car. They must be repacked with a suitable grease.

I have replaced a bearing in the past by finding a used spindle with a good hub and bearing. This is by far the cheapest, but probably not the best way of going about it. I would suggest you:

1) Find a new shop to do the bearing repair.
2) If you can't afford new parts, find a used hub/spindle.
3) Doing a seach here on 'Wheel Bearings' will give you a plethora of personal experiences with rear bearing failure. Many good stories and ways to avoid repeated failure.