Service Left My Machine Completely Unusable

I sent my machine in for a service and repairs and was happy to purchase 15 sleeves to qualify for the free service. When I received the machine back, it was in a worse condition than before. It now overheats, smells of burnt wiring, and none of the functions work. The descaling and cleaning lights, along with other buttons, continuously flash. I specifically sent the machine in because I had family visiting from abroad and needed it working. Instead, I am once again without a machine. This is extremely frustrating, especially as the only issue previously was the milk frother. Now the entire machine is unusable.