Testora IQ Unauthorized Subscription: Refund PayPal Charges & Cancel Membership

I live in the USA and recently discovered that I have been charged for a Testora IQ premium membership that I did not knowingly subscribe to as a paid service. I only remember doing the IQ test online and do not recall agreeing to any chargeable membership or ongoing subscription. The payments have been taken through my PayPal account for the past six months. The charges I can see are $59.99 in February, $49.99 in March, and $39.99 each month from April through July. I am nearly 81 years old and have involuntary movements, which makes it difficult for me to use my phone and navigate websites, and I only noticed these charges after some time. Yesterday I tried to contact Testora IQ via chat to understand the situation and cancel the subscription. During that conversation I was asked many detailed questions, and when I tried to go back on my phone to look up some information, I lost the chat and could not reconnect. I did not receive any clear explanation about why I was being charged, nor did I receive a customer or subscription number. I did not knowingly agree to an ongoing paid membership and I consider these monthly charges to be unauthorized. I request that my Testora IQ subscription be cancelled immediately and that all charges taken over the last six months be fully refunded to my PayPal account. I also ask for written confirmation that no further payments will be taken in the future.