Vitality gym membership cancelled due to "non-payment" despite debit order deduction success

Vitality gym membership cancelled suddenly 31December due to "non-payment" despite debit order collection success in December and January !!!!! My Discovery Health and Vitality monthly payments are bundled into a single monthly debit order which has been running successfully for ages. Suddenly, I am denied access to the gym and told that I haven't paid. I confirmed with ABSA and bank statements that all my payments are up to date. Call Centre logged a case ********** 707 but will take 3 to 5 days to "look into", while my gym membership remains blocked. I have already lost money on prepaid personal training sessions I cannot attend, and took extended leave to attend. Discovery seem unphased and unconcerned - shockingly bad / arrogant business practice, definitely not the way to keep clients.