Expertchatai Cancellation and Refund Process Feels Unclear and Unreliable

I recently subscribed to an Expertchat ai service for around 30 €, but I made this payment by mistake and then decided that I wanted to cancel it and ask for a refund. Today I contacted Expertchat ai by email to request the cancellation of my subscription and a refund of the amount I paid. In their reply, they wrote that they would cancel my subscription and that I would receive a 50% refund within 7 days. I am currently still waiting, because these 7 days have not passed yet, but I am confused and unsure if this information is true and if the cancellation has really been completed as they promised. I do not clearly know through which platform the payment was processed, and this makes me even more concerned. My expectation from Expertchatai is to give me clear and reliable written confirmation that my subscription is fully cancelled, and to explain clearly whether the promise of a 50% refund within 7 days is genuine and will really be processed. If possible, I would like them to review the case again and consider providing a full refund of the mistaken payment, or at least to give transparent information and keep the promise they made in their email.