GM Isando service levels are the WORST!!!!!

I wish I could give this place a zero rating. We bought our 1st car in 2010 at this garage and this was the best dealership ever. Their service and attention to clients was out of this world. This really made us want to maintain the relationship that in 2015 we bought our second car. Big mistake ever!!! From that day to date the service levels have become the worst!! Worse than government offices. The staff makes you feel as though they are doing you a favour. There is no sense of urgency. We recently ordered our rear brake pads and the request has not been honoured. We asked for our refund as payment was made thinking that the order has been honoured, they refused to pay us back. We had to nag them to basically give us our money back. The manager (Niel Land) in the parts department has no respect. He screams at customers and does not care or account for their errors. I really regret that in savoring the relationship we got a big fat kick in the butt!!!