Not opening in Aldiko app also :(

waste of purchasing... unable to open the book

sir it's me rajeshnayak I paid 150 on net bank for
swasthik English grammar book kindly send me
my email or call 9912984988

ఎలా downlode చేయాలో చెప్పండి దయచేసి

I need this book how to find it sir please help me