Incorrect Billing

Virgin Active Collection Menlyn Maine continues to debit R3400 for a gym membership despite having called them to add my Vitality over 3 months ago and to reduce my subscription to R1700. Their collections department always promises to allocate someone to assist urgently and nothing materialises afterwards, lastly they have sent me to my branch - the branch then told me they can’t help me with the previous 3 months debit orders as they can only correct my current billing going forward. Such incompetence from a reputable business is unacceptable and their silence is concerning.