Service Engine Light On problems of the 2015 Chevrolet Colorado

Purchased 2015 Colorado July 2015. We had it in for oil changes & a few times regarding hesitation of acceleration. Service techs did not type complaint when in for oil change only when brought in specifically for acceleration issue. They stated it was our fault we did not read the work order. It is not my job to read a work order it's the service techs job to enter every complaint or issue addressed by the customer. The last service was when I spoke to sales manager who set me up with service manager & I was assured me a tech would drive vehicle for a week to and from dealership approx 40 miles per day so they could diagnose the issues. I had advised issue is intermittent; the reason they could never duplicate while in for service. They made sure to state it was running to manufacturer specs. They drove it 10 miles not 40 miles a day for the 7 days they had it. Then said exactly that it was running to manufacturer specs. Of course it did, you did not do what you promised wasting my time & kept my vehicle for 7 days just to pacify me. I told the sales manager what happened who I purchased the 2015 Colorado & my 2014 camaro that I would never buy another chevy product as they would not stand by this issue, their customer or the lemon law. Today my husband is in austin texas with his truck in the shop again as truck now has a service engine light on; of course still has the acceleration issues as that was never addressed or fixed. We have to pay $800. 00 to fix engine issues on a 2015 vehicle, this time no warranty even though we thought we were given a 75k warranty when we purchased the vehicle. This is the only thing I can think of doing prior to retaining an attorney to fight for the lemon law for a vehicle we bought for 40k. We have had issues with this vehicle since purchase & I am hoping I will get a call from someone from the NHTSA regarding this complaint!.