why not lease it they rip me off manchester New Hampshire

i went to sears and i bought a t.v with a credit company name why not lease it . the sales person in sears told me the t.v about $450.00 hi said why not try this company ( why not lease it ) give $150.00 down and 5 payment of $105 so me and my wife said ok . know i call the company why not lease it ti fine out that everything is ok and pay for, but the sales person from why not lease it  her name is verenice told me that if i want to close the acount i must pay $342.00 more to close it or keep paying 105.00 for 18 month  then the t.v would me my .i said are you crazy , she said  when you got your receive you should of read the rules . the sears sales person never told me that