Karvy — Unable to encash dividend Dd

Since last 2 years I am unable to encash dividend of shares of different companies. The money is pending with Kfin technologies Pvt Ltd. The problem started from the date of merger of banks. State Bank of Travancore became State Bank of India. To do this correction in my Demat account I approached our local Karvy, Thrissur branch and sent our request to head office, Hyderabad. I also written to Kfin Technologies for the same. Till date there was no action taken and some seven DDs are with me for encashing. Kindly advise/take necessary action immediately.