Meesho aap - Package not delivered

I ordered a package from this app. They said that the delivery will be done by **/**/****. But till date I have not received my order. They are frequently changing the delivery date. I tried to contact the customer care through their phone number and eamil id. But when i call on the phone number, they say that we are upgrading our services for you so please try through email. When I go for the email option, they say that call on the helpline number. There is no one to whom I can talk and resolve my complaint. They have shipped through xpressbees courier, but they too are not responding. Their customer helpline is also not working. I tried to call them and email them but with no response from them. This is very irritating and I've also paid my amount there. I can't even cancel or ask for a refund of my order, because I am sure, I would not receive any help from them. Please guide me in this matter.