Online dating query

Hi there
Curious to know if anyone has had any payment issues with online dating websites. I registered last year and my period of registration expired (it was a discounted term).
I have been sent an invoice by email and I intend to make payment, however the administrators email to say they a pending invoice to forward along with the original. What is the position with online charges like this, can they just charge what they like or how do I proceed with minimal costs my side?? I would like to settle the thing but dont want to be charged outrageous amounts!!! I acknowledge that I missed the payment originally!!!
Any help appreciated!!!
Cheers

Could you edit your post, It's not really clear what you are asking.

How did the dating work out?

Sorry, new to this website.
I suppose I am curious to what rights I have in arguing their billing procedures. Can they basically charge whatever they like now or do I have certain rights? I tried to ascertain from the website what terms are relevant but it's not very clear to me.
I hope this is clearer!

It will have been in the original terms you signed up to. Most have something like you must cancel a week or so before the original offer expires or you will continue to be billed.

'hope it worked out for you. Best investment I ever made ;-)