Jammu & Kashmir Bank / J&k Bank — Mpay login

After installing the mpay app on my android device and putting in all the necessary credentials like card no, pin etc. the message which is displayed everytime reads as "Customer ID is already register for Mobile Banking. Kindly contact bank for further details". As I am out of state for my study purposes, I couldnt personally visit the bank branch. Kindly provide the solution for the same.
Thank You