KreditBee — payment issues of loan

Hi,
I have taken a loan of rs 1624 from kreditbee app. I have paid the bill but still they are continously calling me and saying the payment is overdue by rs 30 at last they are saying ignore if paid. They are sending sms too. But after doing this thing they directly messaged me that "despite several reminders, re-payment of rs 1744 is still not received and it is over-due by 9 days. Request you to make the due payment immediately, failing which your credit history will be impacted and we will be forced to initiate legal action against you". I thought maybe the payment is not received that's why again i paid the bill through debit card but now they are saying the repayment has failed and it will be automatically credited within 7 days into my bank account. I am very disappointed by this kreditbee. By paying the bill several times they will take legal action against me. I really don't know what to do know.