Disappointed aftersales

I took my car to the mentioned company to replace my transfer unit. After receiving the vehicle back, my vehicle was still leaking oil after they said they are going to replace a seal between the transfer case and gearbox, which I also paid for. The car's CV boot was also damaged in the process and was pouring out the grease while I was driving back home. I asked what they would do about it, but after a week now they are not responding to my phone calls or messages.