I sent you my grievances twice by mail

Dear Sirs,
First of all I wish to convey my sincere gratitude for the service rendered to me.
Now I wish to tell the unpleasant and irresponsible service extended to me when I obtain a second idea connection.
I sent you my grievances twice by mail; but unfortunately no positive response till time and therefore I am leaving the Idea connection.
Thanks a lot for the services extended to me.
My Old mobile number is 9847172518