ShortsWave Ignored My Refund Requests After Repeated Billing

I subscribed to the SHORTSWAVE VIP plan for about a week in May, then cancelled the subscription and have not had an active subscription with them since that time. Despite this, they have continued to charge my debit card 17.99 on a weekly basis. Reviewing my bank activity, I can see 17.99 charges on June 15, June 22, June 29, July 6, July 13, July 20 and July 27, which comes to a total of 125.93. There were also a few random 0.14 charges. I am not including the early June payment, as I accept that one as part of my initial usage, but I did not authorize any of the later weekly payments after cancelling. I contacted SHORTSWAVE support from my email address caeno***@gmail.com on July 20, July 24 and again today, clearly explaining the situation and asking for a refund of the unauthorized charges, but I have received no response at all. I find this lack of communication and continued charging after cancellation to be a very troubling and unacceptable business practice. I request that all weekly 17.99 charges taken after my cancellation in May, specifically the seven payments totaling 125.93, be fully refunded to me and that any further charges to my card be stopped immediately.