Leisure centre charging more for direct debit than upfront but won't say how much more. Allowed?

Misd_sixties22

Hi
My leisure centre has just offered swimming lessons via direct debit rather than one upfront payment per term.
It looks to me as us direct debit is more expensive as it's for 12 months. I emailed to confirm this but just received a 'its a little bit more expensive' as a reply. I think it works out to about £25 more, equivalent to approx 5 lessons. My question is, should they be clear that direct debit is more? Are there any rules about this? There was nothing on the leaflets stating the costs verses upfront payment leaving customers to figure out costs themselves (not easy when you pay termly and term lengths change each time). I wasn't happy with the vague reply either as I had asked for specific numbers.
Can anyone advise please so I can form a reply.
Thank you.

dawyldthing

You need to ask how many weeks there’s no centre then split it accordingly.

Like if you have lessons on a Monday ours shuts every bank holiday so that’s 5 gone, then if the other 3 fall on a Monday that’s 8 gone. So you’d divide 44 by £300. But there might be more or less lessons, just depends really.