Left my car for a diagnostic..... after keeping my...

Left my car for a diagnostic..... after keeping my car all day the said my aux. Battery needed to be replaced... so i did but my car still jas codes flashing randomly. Called back several times with no answer or call back. They only called for a sales call to check if i wanted to trade in my car.... i told them what has been going in and they hung up and never heard from them again...... this place sucks beware.