@kosarkas113
After a quick google search, i found an email adress consumerservice@dimoco.eu
After a closer look, DIMCO is just the infrasturcture some other apps use to handle their payment.
In you case its Handylernen B.V.
On this site, there is a link to cancel you ABO: FAQ – Handy Lernen
But be careful, this whole thing looks very suspect to me…
They were in the press not long ago because there were sime ads from them in the sbb-app
br
maxell182