Outside house painting

Hello, not sure whether I’m on the right site, but have rendering which needs painting. A guy came round and he charges £250 per day and quoted roughly 1 day to prep and 1-1.5 day to paint each side of the house (3 sides) we are now on day 3 and one side hasn’t even been finished. I’m getting a little concerned that we had budgeted and where we stand as not very happy at how long it’s taking and how much the cost is spiralling. Whenever we’ve had work done before it’s a job price, so this is a grey are on how to handle the situation. Thanks