Podio/Citrix Refused to refund, and harassment via email Raleigh North Carolina

I purchased a subscription to Podio's online services for a $24 monthly fee, in February of 2018. Shortly after, I logged in to cancel my services as I found their service unnecessarily difficult to use.

Despite my cancellation, they charged my card again in March and April. I began contacting them about those charges, asking for a refund. When I logged into my account, it stated the account was cancelled and not active, yet I continued to be billed. While communicating with their "support", they stated they do not provide refunds, and refused to do anything about my cancellation/account status.  

So I filed a dispute with my credit card company for the 2 charges. The CC company found in my favor and reversed both charges, refunding them back to me. As soon as that happened, it must have marked the invoices as "unpaid" in Podio's system, and they began sending them to me again on a daily basis.

I again resumed communication with their support, asking for them to close out my account, close out the pending invoice and stop communicating with me. For about 3 weeks we went back and forth, with them failing to understand what I was asking for. They responded to every email stating that they don't process refunds - I wasn't asking for a refund, I had already been refunded by my CC company, I was asking them to stop emailing me about the invoice that had already been decided in my favor.

Finally I get an email stating my account was closed and I wouldn't get anymore emails. I went about 5 days without getting the invoice sent to me, and then it resumed again - this time being sent to not one, but TWO of my email addresses. The lengths they will go to, to harass a customer over a $24 bill is asinine. It has been four months and the issue is still not resolved, and I continue to receive daily emails about my "outstanding" invoice.