can any senior members here pls advise

bought 1 unit of Lenovo Y510P from Stephen ( https://forum.lowyat.net/user/storm88 of TECH ARMORY) on 24/12
https://forum.lowyat.net/index.php?showtopi...507863&hl=y510p
asked him if there's any issue with the laptop is there any 1 for 1 exchange
he said yes for 7 days only

on 25/12 i noticed there's a gap on the laptop lid

i asked for advise if this is normal in the Y510P threads
https://forum.lowyat.net/topic/2851949/+2500
https://forum.lowyat.net/topic/2796033/+2060

i called him today
a lady answered & said he's busy
i told her the problem & ask to exchange another unit
she said they are out of stock
so i ask her how to resolve this issue then
she told me to hold on & she asked Stephen

after that she told me that when i went there i already saw its a new unit
even i'm still within the 7 days exchange period they are out of stock

so i ask her can i send back for refund
she then told me that Lenovo have change their procedure
any issues should be dealt directly with Lenovo
& i should go to Lenovo service centre

my issue now is
1. i went to purchase a NEW unit - so am i suppose to expect other than a NEW unit ?
2. storm88 of TECH ARMORY didn't tell me that the 7 days exchange is to be done at the service centre
3. 1st she said no stock then she said Lenovo change procedure
4. from the response given by the lady, i presume that they are also refusing to accept the unit back for a refund

can any senior members here pls advise
is it true that we should go to Lenovo for the 1 to 1 exchange

thank you very much for your help

what's right for u not necessary right for others. 2 other forumers here also not accept it.