Bajaj Finserv — mandate rejection message

Address:

500091

Dear customer, mandate for your bajaj finance loan has been rejected by your bank, for successful emi debit from your a/c & to avoid monthly mandate rejection service charges click here https://bit.ly/2ZcMtbG to register the same online under customer id[protected]. Regards, bajaj finserv.

Hello i have applied for health emi loan its was approved successfully and now i am getting this above message what to do
I tried contacting the bajaj executive who helped me with this loan. He is not responding properly

What to do now how to solve this problem