Dealership issues on timing chain
Long story short, im trying to stay out of car payments for a bit. So my 2011 gmc terrain v6 had the dreaded timing chain issue. My local dealership quoted me a price, told me to bring it in amd the parts would be there the next day and within 2 business days it would be done. Well, 2 more days will make 2 weeks that they have had it and still isnt done. Now they had issues getting parts in and blamed gmc. For it. Parts actually came in 3 days later, not overnight. Then, not all parts even came in on that 3rd day. 1 part actually came in 1 full week after them having it. I call today and they told me the guy was under the car. 30 mins later a different guy called and said the mechanic that was working on it had a death in the family. Im just getting a big run around. How should i approach them about adjusting the cost of the repair? Its taken way longer than promised and my patience is running thin. This is a certified gm dealership, by the way. I guess only one guy can fix my vehicle. No one can cover for him if hes out?
Sorry for the rant, but im beyond frustrated but havent delt with dealerships before.