Trai — unsolicited calls

Address:

Bajaj Finance, 8th Floor, 3 Anna Salai, Chennai, Tamil Nadu, 600031

I have been receiving regular unsolicited calls from bajaj finance tel no : [protected]. I have told them many times not to call my number [protected], however, they hang up and after a day or two, a similar call offering loan is received, and sometimes on saturday / sunday. The address on enquiry is address 8th floor, raheja towers, anna salai, chennai.
In spite of telling them not to call, i get calls offering loans
I have registered for do not disturb with airtel / trai.
It is sometimes franchisees of bajaj finance that call and disturb.