Poor group class planning and no off-site cancellation possibility

After several attempts to bring this challenge to the attention of the Claremont branch of Virgin Active, including a written review card, a formal complaint at reception and feedback via email, without any follow-up from anyone, I have to resort to Hello Peter. The aqua aerobics class is perpetually booked full, in advance. On Thursdays, where they have two classes, those two are also fully booked as soon as bookings become available (I am imagining a group of old ladies waiting up until midnight and then booking them en masse like it's bets on a horse race). The only chance of doing this class is by waiting on Thursdays for cancellations minutes before the class start, and then participating. This is the only class I can currently attend and I think there is sufficient interest to have two classes every day, please. Otherwise my membership is pointless and I have to cancel. Only, one can't cancel apart from going into the branch - why is that? Especially in this time of covid? Why can one not cancel via phone or email? So, two issues, looking forward to finally getting some feedback.