Sony — Defect in 29 inches flat screen purchased within 1 year

A Sony Flat Screen TV(29 Inches) was purchased in December 08(Model No)-SZ292M88.Not even one year had passed it showed a tuning problem in the month of October 09.Complaint was lodged in the sony customer service centre as we were still covered under the Warranty period on October 01,2009.Service engineer had come on October 03 2009.It looked he didnt have much knowledge about repairing the moment he had left the tuning problem had reappeared and .Complaint was again lodged on October 05,2009 and was told that the service engineer would be coming on October 06 for repairing but nobody had come.