[Resolved]  Samsung / Microwave Oven — Frequent failure of Magnatron of Microwave Oven

I bought C10FL Samsung Microwave Oven bearing Serial No. 01657DAX001037D from National Electronics, Sakchi, Jamshedpur, in May'04. Since then, its Magnatron has failed 6 times. For 1st 3 times it was replaced without any charge, as it failed within 1 year, though 3rd time I had to pay for the labour charges. Rest of the times I had to pay.
Last time when it failed I asked that paying Rs. 1400 in every 6 months is not possible for me at least I should be given a gaurantee of 6 months for this, if not then please take it back, as I am fed up with the machine. So I was given a gaurantee of 6 months and now it has again failed, but this time Service agency has changed and they are not entertaining with interest and delaying the repair.
Please look into the matter and help me out, this is first Samsung product in my home and I hve already promised myself not to buy any other product of the Company.
Based on the above experience I have asked my friends not to buy the Product from the Company, please help me so that I can chage my view.