Currys demo unit purchased

Hi everyone. I have purchased a display unit from Currys that was running a retail demo in store.

I am unable to remove demo mode by resetting, rebooting or powerwashing the device - as it continues to run demo mode.

Ia friend helping me out has read that it is possible that Currys centrally manages the software used to run demo mode and we are going to contact them today to see if they are able to remove it from their end when I provide proof of purchase.

Just wanted to check if anyone had any suggestions that we could rry before we do this - or ask if anyone has any personal experience of contacting a retailers central tech support for a similar issue at all.

thanks in advance.