Klaviyo: Email Marketing & SMS

the product works well,BUT the cancellation part is grey, I removed the app from Shopify thinking that everything was done and canceled, they keeping me charging $20 for the next 2 month, when I wanted to cancel I had to fill up a form and confirm by email, really tedious and grey cancellation procedure, instead of doing everything directly from Shopify, just gave them $40 for not sending any email, instructions VERY unclear, and they take advantage of all the users using Shopify in "auto-mode" installing and uninstalling and no need to think about it anymore, completely disappointed.