Crownit — Receiving tooo many text messages from this app. And I also submit a form to stop stop receiving these messages but no use.

Receiving tooo many text messages from this app. And I also submit a form to stop stop receiving these messages but no use.Still they are not stopping the text messages. That messages are soo irritating me. I submitted a form to delete the account also. But no response from them. Please solve the problem. Thank you