Awful after service experience with Virgin Active

Very unhappy with the level of service received from Virgin Active. I decided in April last year to cancel my gym membership. I went to the counter at VA and was assisted by a staff member. This person gave me an amount to pay which I did so immediately. In December I get a phone call to inform me that I owe money. This in its own is unacceptable as I was under the impression that I had settled what I owe. Upon receiving the statement in my inbox I emailed the accounts department to find out if I could pay half now and half next month as this is an unexpected expense. Absolutely no response. Perhaps I shouldn't be surprised since it took them 8 months to contact me in the first place after I cancelled my contract. Now I am sitting with a statement wanting to pay so I can move on from VA and there are no banking details to be found. So do you want your money or not...? VA need to catch a wake up.