best buy electronic insurance

On dec 13 2007 i purchased a sony viao from the best buy location on blanding, during this time my computer was a spercialty item that was only available for a short amount of time. 2 months later my laptop started getting alot slower getting to the point that it would freeze at times. i purchased a warranty from best buy when it was purchased and as well i was tol that i had the best insuranse available as i do on my other best buy electrinic accounts. however after goin back and forth from sony and best buy for no less than a total of 3 to 4 months best buy finally told me that since they lost the paperwork in the computer stating previous contacts i had with them and as well informed me of the fact that my insurance was insufficient and would not cover the damages made to my laptop (this sould not have happened, i was actually sold the same warranty that came with the cpu for FREE) i was undersold by the salesman and lied to about my purchase. throughout the ordeal i was told up until recently that any damages would be coverd under the warranty that i have purchased. since this time managers have bounced me around for an un accceptable amount of time and at this point i am asking only to have my cpu repaired. please respond soon