OK, I'll bite.........
1. You went to the store to get the battery changed (replaced?)..... Why didn't you just get a new battery?
2. Apple tested the battery (that needed replacing) and that didn't work? Why would testing the battery be a replacement for replacing the battery that did not work in the first place?????
3. Something to do with the the Macbook? Since the battery is a component of the Macbook, this is hardly anything more than a statement of fact. Perhaps a return trip to Apple might be in order. Ask them to e-mail you the diagnoses. Heck, write it down on a matchbook. You're not giving us much to work with here.
4. Ideas, help? If the battery is bad, replace it. If the Macbook is bad, have them fix it. Pretty much exhausts my ideas. Perhaps the more advanced board members have more ideas. Good luck.🙂