Why do you make it so difficult to pay you?!

I used to pay my monthly fee via a transaction on my credit card that was automated. A few months ago, Virgin Active suddenly stopped taking credit cards as a form of payment - The issue with this is they now stop us members from getting the cash back from Discovery Vitality by paying with our Discovery credit cards (which effectively decreases our monthly membership).

Please tell me how it is fair to stop us paying with a method that enables us to get a discount on a deal that YOU (Virgin Active) signed with Discovery??

So now I need to pay manually every month (with my credit card anyway!) and on top of that - every time I enter the club there is a message on the screen that tells the person working to get me to update my credit card details (which I can't do!), so I get stopped EVERY SINGLE TIME that I visit a club! The only solution your staff offer is for me to provide my banking details for the debit order - which then means I don't get the discount.

PLEASE either (1) let me update my credit card details (cause I pay that way anyway!) or (2) lower my membership fee to what it would be inclusive of the discount that I would have received and then I will gladly provide my banking details. I've been a member for many many years and I don't see why admin needs to be so frustrating.