Opel customer service

My 2016 Opel Astra have been booked in at Reeds Opel on 27 January 2018 and have not been able to be fixed. I only get an update if I phone and ask. In my sixth week of waiting, I still don't have a courtesy car from Opel to use. The Opel Care center just refer you back to the dealer. Before the changes in January 2018, I was able to go to Perdeberg Malmesbury. I had a few problems in last year and every time they were more than willing to help and always provided a car for me to drive so that I am not inconvenienced even if it was one of the secondhand cars from the floor. I would like to know why Reeds Opel think it is ok to use GM as an excuse to give poor service. And if GM leaving is genuinely as big a problem, what is Reeds group, WIlliams Hunt and Unitrans plans to correct the shortcomings. We are now in March, 3 months after the changes. In the meantime they are chasing away any hope of return customers.