Stalkbuylove — unable to exchange product - no reply from their side

My order (Order#[protected] has been delivered to me, yet the status is still showing as dispatched in the app for stalkbuylove. Hence i’m unable to initiate my exchange request.
I need to place an exchange request asap for both the items in my order to be exchanged with a bigger size as they are not at all fitting me. I mailed them thrice & even left my contact details in their app twice but didn't get any reply in any form from their side. They have a very poor customer care, i must say. Please help me out on this.