Ideal Buick GMC

I was scheduled to have recall repair done on my truck. I called to set up the appointment and was told it had to be ordered and I would receive a call back when the part came. Part comes in and then I have to wait 2 more weeks for an opening, they're busy I understand, I take a half a day off work to make appointment. 1st when i get there Im told i will take about 4 hours opposed to the 1 hour the young lady in service told me it would take, so I drove myself and need to find a ride, I chose to have my oil change since Im there. After about 30 minutes the service tech guy tells me that my part has been sold! They will still do the oil change but my part it gone, so I just wasted my day and will have to do this all over again! This was November 2017! I called and left the service manager a message but was never called back. Well today January 2018 I get a call from the same lady who scheduled me last time and she tells me the part is in and they can schedule me again. No apology about last time and told again it will be a hour. I politely ask can I at least get 50% off a oil change and was politely told "NO" but she make sure the part is here this time. This is very poor customer service and pretty unbelievable that I received no apology or even a discount on a service or anything!