Brother Scan n Cut

I have bought a Brother Scan n Cut CM900 and the mat keeps going skew when cutting. I have complaint by Brother in Port Elizabeth, no luck, complaint by Brother JHB. They fetch my machine and send it back after 4 weeks and it still did the same thing and they have broken my touch screen. When i complaint again they fetched it again and after 2 weeks they send my machine back, when I opened it, guess what it was not even my machine. This one is second hand, the screen is scratched and the plastic was off (my machine was still in tip top condition, plastic on with no scratches) except the mat that keeps going skew. They keep on testing on only paper and I cut stencil material. When I asked them to test they said ok they will by they never did. I have a business and cuts for customers for they projects. I am very unhappy with the way Brother is handling my case and if this is the way they treat their customers I will tell the people not to go there even if the machines is very good, just because of customer service. This is going on from before lockdown. Then the said to me it is because I have an old mat (which I bought at Hobby X this year). I then bought another mat for over R500.00 and it still does the same thing. I need this to be resolved please.