Hi, I have recently (<2 weeks ago) purchased a BV 7000 PRO and have turned it on this morning after a full charge, unlocked it using the touch screen and now the touch screen has become unresponsive. Could you please advise me as I am not even able to turn it off as selection of 'power off' requires the screen. Many thanks.

Flash to the latest Firmware and perform a factory reset in recovery* after that.
You can make inputs by using a usb mouse over otg cable.

*wipe data/factory reset in recovery (this will delete your data/settings):
- Power off and then press Power and Volume-up together for around 10 Seconds
- be sure that the little arrow point on recovery (select with volume up, enter with volume down)
- Then the open android with red triangle+"no command" is shown - press Power and Volume up together again
- Select Wipe data/factory reset with volume keys, confirm with power
- After factory reset select reboot system now

Please report if this solved your issue or not.