Over Debited twice by Virgin Active

When I first joined Virgin Active, they mistakenly over debited me, I understood that mistakes happen and I ensured they course corrected it. However last month I called to cancel my month to month subscription and was advised to lower my plan and my new debit order of R385 will go off 1st June, however I was debited for R733, this is my second very bad experience. To add I raised this with them and over 48 hours now, I received no response from Virgin Active. They go soo big on ensuring their gyms are good but their customer service department is extremely slow and they mislead you. I should have just cancelled.