They’re taking the ■■■■ mate, you could down the route of lodging an official complaint or even contact DVSA to tell them what is happening. However both of them options are quite extreme and my own way of dealing with it would be to beat them with their own stick; I once received a phone call whilst parked up on a night out at 1am asking me what time I was starting that day, my plan was for a 5am start, but my response to them was “9 hours from now” and I put the phone down and started at 10am. They never did that again.