IQScore.me Charged Me Recurring Fees After a One-Time IQ Test Payment

I am writing regarding unexpected charges from your service IQscore.me/us. On 16/05 I took an online IQ test on your website and paid 1 USD with my Visa card. At no point was it clearly explained to me that this payment would start a recurring subscription or weekly charges. After this initial payment, my card was charged by IQSCORE.ME for 19.99 USD on 19/05 and again for 19.99 USD on 26/05. I did not clearly consent to a paid subscription or ongoing payments. I only intended to pay once for the IQ test and was not aware that I was entering into any kind of membership or recurring service. I request that you immediately cancel any subscription, membership or recurring payment linked to my card so that no further charges are taken. In addition, I kindly ask for a full refund of the 19.99 USD charged on 19/05 and the 19.99 USD charged on 26/05, as I did not knowingly agree to these recurring charges. Please confirm in writing that my subscription has been cancelled and that the above amounts have been refunded.