Is my DS’s tutor being unreasonable

[PWPmum]

My DS 11 who is in year 6 has a weekly tutor to help him prepare for his SATs and support his spelling. He is dyslexic. She insists on being paid at the beginning of the month with the sessions she will teach agreed in advance.
My DS is not well today. So I contacted the tutor to let her know he can’t do the lesson today and asked if we could roll the lesson over
she has replied saying as the cancellation is on the day and her time is booked out, there is no rolling over or refund.
But there will be no lesson today so part of me feels why should I pay?
She’s offered to teach him at the weekend but we’re busy then.
I’m not sure if I’m being unreasonable or not to push for the credit to go towards next month or not.

If you cancel, then she loses the money by rolling it over as she can’t get someone else in that slot. It’s his one of those things!

You aren't her bloody saviour and recommending her to a few of your buddies doesn't entitle you to a chunk of her wages or excuse your late payments.

why does he need a tutor? He is in year 6 and is probably under enormous pressure at school. Give him a break!

Of course you should still pay. You're not just paying for the lesson you're also paying for her time. She may have turned down other work to fit your Sons lesson in & therefore she needs paying for her time as she could've been earning elsewhere. Also if she's booked in advance she'll have an idea of her monthly income & will budget accordingly. Her outgoings won't change just because your circumstances do. She has offered an alternative time that suits her but you can't do that time. Again that's not her fault. How would you feel if you turned up to work & your boss said 'oh you're not needed today go home & we wont pay you?'