Tata Consultancy Services — Not received FFS after 45 days

Address:

Tata consultancy services, Rodas Enclave, Park Ln, Hiranandani Estate

Its being more than 45 days and I am still waiting for my FFS. I am not getting any reply from HR and in alumini it's just shows me to connect with HR for IS clearance. I need my service letter and it's really disappointing that they don't care to reply or provide status. I want my service letter