Refund – TapeACall Pro: Call Recorder Review

I purchased this app before there was a subscription service. As with any app, if it was purchased, I assumed I would have it available to me for the duration of my apple account. However, now that it is subscription-based, what steps would I need to take to get a refund for my initial purchase?
Review by Sonicplayaaas on TapeACall Pro: Call Recorder.