Samsung Poor service on faulty S5 Mini

I have got a Samsung S5 Mini with Dual Sim supp**** by my service provider. On December the second sim stopped working and did not want to register on the network. In January, I have taken my phone to one of their Smart Care Centres and explained the situation. They then recommended they need to change the main board of the phone. First Samsung sent the wrong main board to the repairer and after a month they only supp**** the correct main board. When I took the phone to the Smart Care Centre, the found that the second IMEI number on the second sim is missing and thus cannot program the new board. The repairer contacted Samsung in this regard and has up to now not even got a response or solution. I also logged a call with ref*** in order to get a solution. Samsung keep saying they will come back to me to resolve issue. I have spoken to 5 different call centre people and even a Supervisor. So, up to now I have not received ANY feedback and it is going for 3 months now. At this stage I am very upset with the service and disgusted with their promises. They cannot even track their own phone data in order to resolve issues. SAMSUNG I AM STILL WAITING FOR YOUR NEXT EXCUSE.