Poor, lazy service from Vitality Finance

I contacted Discovery Vitality to amend, my banking details, for future, vitality gym membership, premiums. my current plan is R280 pm for a national membership, which needs to be debited on the NEW banking details which ihave provided to Vitality and received a confirmation reference that the details have been amended. Finance was supposed to amend the banking details and supply me with the new date of debit order