I do have the e-mail, they answer very fast
support@cashwalk.io
good luck
Pamela Cubas
if you want to do it directly form the app, go to the front page (the one where you look at the luck boxes, in the left you will see a hamburger (the one with the three lines) open it and then go to the geat at the right top in the yellow tab) there you will find the menu called "contact us" it will take you directly to the e-mail composer