sweepstakes clearinghouse PAID FOR A NEW LAP TOP USED ONE OVERHEATS IT HAS A (DO NOT USE..they sent me a clearly labeled faulty piece of equipment!! dallas texas

I received vouchers in the mail for $310.00 each.I used 3 of them to put towards merchandise..I purchased a stereo,a set of cookware and a laptop.I am most displeased with the laptop..The description they gave was a high quality unit.From the beginning it overheated..I didn't know much about that.so I would turn it off.EVENTUALLY I just put it away.RECENTLY I decided to have it looked at and was discovered that on the bottom of the unit is  a part marked DO NOT USE! it is a major part of the function of the unit;I was told. So they knowingly sent me a computer with a broken part..I have not been able to get a response from them on this matter,I paid 280.00 of my cash not including the voucher,What can I do about it now??                                                                                                                                                                                                                                                                                                                                                                                                                                             Thank You  Sherry Wiese                                                                                                                                                                                                                                                                                       ******************