Mahanagar Telephone Nigam [MTNL] — To replace telephone set with caller id

We are consumer of mtnl phone No.22779564 with caller ID situated in East Vinod Nagar since 1998. Out telephone set was broken four months ago and not working. We comlained numerously during four month and you can see the record. MTNL di not replace the telephone set inspite of repeated complaints . Please re[;ace our telephone set or we have not alternative except to surrender .