Hint Taking Payments Without Permission

I have discovered that a company called Hint has been taking money from my Barclays bank account via PayPal without my consent, and I want this stopped immediately and the amounts refunded. I have not knowingly signed up for any subscription, free trial, or ongoing service with Hint, and I do not recall authorising them to charge my account. Most recently, there have been payments taken on 31 March, 4 April, and 7 April. These include two separate charges of £0.50 and one charge of £29.99. I am very frustrated that this has been happening for some time without my clear consent or awareness. I request that all unauthorized charges taken by Hint via my PayPal from my Barclays account be fully refunded and that any subscription or payment arrangement linked to my details be cancelled immediately so that no further money is taken.