Still Being Charged by DramaBox

I had a monthly Dramabox subscription, which I cancelled in March through Apple, but I am still being charged 18.99 every month. Despite cancelling at that time, the subscription has continued to renew and charge my account up to now. I have not been able to figure out how to reach either Dramabox or Apple customer service effectively about these continued charges, so I have not received any explanation as to why the cancellation did not take effect. I request that the charges taken from March onwards be reviewed and that I receive a refund for the unjustified renewals, or at minimum that my subscription be fully cancelled so no further payments are taken from my account.