sethpilk

I recently experienced a sewer line break at my home that was built in 2007. The break occurred in the front yard where the sdr and abs lines connect. The plumber that repaired the line said that the coupling that was used to connect the sdr and abs pipes was a cheap coupling, so it slipped. The original contractor ran the cleanout underneath my front porch stairs, so I had to replace concrete and it ended up costing me $9,200 to get everything repaired and I'm being told that insurance won't cover the repair. My question is, was the coupling that was used to connect the sdr and abs lines within code? The plumber that repaired the break said he didn't understand how the original contractor ever passed the city's inspection when the home was built. I've attached images of the coupling that failed. Thank you for your help!