My Flower App - I want my refund

I placed an order from My Flower app (Order Id#*********) website on **/**/****. One cake and one bamboo plant. The delivery date was **/**/****. But they called me in afternoon of **/**/**** that your cake can't be delivered at your delivery location so we will refund the money you paid for the cake but we will deliver your bamboo plant. But till date I haven't received any thing not the refund money nor the bamboo plant. Now I want complete refund I don't want their bamboo plant too. I called them many times and mailed them too but no response received.