Calender month has always been on the 1st of the month except for Afrihost

Extremely unhappy. We gave notice 1 August on one of our lines as the house was sold and transfer to go through 31 August. Yesterday I queried why they debited me again to be told in their eyes a calender month is not on the 1st but the 31st. So because my notice was given on the 1st I need to pay for 2 more months even though I don't have access to the line. I think this is disgusting. Very disappointing and every email I send i receive the same answer clearly no one that actually cares feels like I'm talking to a computer