Grease monkey county line and holly Grease monkey for got to put oil in my car how about you Centennial Colorado

 I went to get service on my truck nothing special at grease monkey on county line and holly they did my oil transfer case oil and my rear differential. well I went on my way when my rear differential started to grind so I went back and long behold they didn't put oil back in it. the manage told me don't worry we have insurance for these thing it's happened before so i went on my way. but a week past and I keep getting the run around so I got the number to the gm of the location called him all I wanted was my truck fixed. I even told him if he bought the parts I would do the work my self. I thought was a fair deal scent i got a quot to fix it for 1900 and the parts were only 650. but all I got from the gm was run around and at the end of are conversation he ended by saying go f*** your self. I am going to file a lawsuit if anybody would like to join please contact me at (((REDACTED))) thank you