The lower part (about 40%) of the screen is not responding, means: not recognize the touch of the fingertip. The result is, that the phone is unusable. Any ideas?

The lower half of the touch screen is not responding anymore..Nothing helps.. some ideas how to fix or get support from BV?

Dear Blackview team, would like to get a address to send my phone (BV6000s) to repair/service. The lower half of the touch screen is not responding anymore.. This is my 5th time that I ask for support/contact.. Your contact-form at Blackview website is not working, - after writing & sending a me...