DMI Finance — My Samsung mobile finance

I have been paying fine for your irresponsible dmi financial system service,
It is my worst experience with your Samsung mobile loan,
This message of April 13 th it clearly says my Bach is Registered.

NACH mandate of Samsung Finance Plus Device loan from DMIFinance for 2049.0 per month, issued to DMIFinance registered successfully. To know the details click here https://play.google.com/store/apps/details?id=com.samsung.android.samsungsure . Any issues call [protected] -Samsung

This Is 7th may message

NACH mandate for Samsung Finance Plus Device loan from DMIFinance is rejected by your bank. Make immediate online/offline payment to avoid restrictions on phone. To make payment click here https://play.google.com/store/apps/details?id=com.samsung.android.samsungsure -Samsung

Show me the rejection details