Virgin Active billing more than what’s owed.

A virgin active employee at Bel Airs, by the name of Philip has charged myself and 3 other members the incorrect amount for 3 months. We were given a deal based on the fact that one of us had a vitality membership and therefore could apply for a referral discount. The problem has persisted and now Virgin Active owes us a considerable amount of money. Nothing is being done in order to rectify this situation.