Legal Notice is served by an authorized lawyer/advocate on behalf of the client to the opposite party with a purpose of giving them a last opportunity to settle the matter out of court, before one proceeds with the legal proceedings in a court of law. This is also necessary because of the fact that courts are already burdened with numerous matter and it is highly advisable, if the matter can be settled out of court.
Further, Legal Notice communicates the intention of the complainant in clear terms to the opposite party and acts as a legal warning that in case matter is not resolved within a specified period of time. The matter would be taken up with a consumer court. This makes them act in most of the cases, else the matter can be filed with a consumer court.
In case you are interested in service of legal notice, you should contact here.