Virgin Active refusing to take responsibility for not having an online membership cancellation option

I had a Virgin Active membership for 12 months and was due to expire at the end of April 2020. I tried to call and send online inquiries in March to notify Virgin Active that I will not be renewing this contract and that they should cancel. I struggled to get through as there was a lockdown. Now in September they just debited my account. I called the head office to cancel the membership and now they are asking me to pay cancellation or wait for a month of September as part of the notice period. They have already tried to debit my account for R900 for the month of September. I am utterly disappointed at the handling of this matter. I cannot pay for the COVID-19 inconvenience which is neither my or VA fault. I will never use Virgin Active ever again!