contacts mysteriously disappeared and keep losing new entered contacts

[jeremycheong]

Hi, I need an urgent help. Few days ago all my contacts suddenly disappeared. I couldn't retrieve it back at all even though i restart my phone and etc. I tried to re-enter a few new contacts into my phone, but on the second/third day it disappeared again. I just bought this phone less than one month and i asked the dealer, the dealer replied me they never encounter this problem and Im the 1st case for them. They even advice me to reformat my phone. Should I? I only installed a new application swype beta, i dono this will affect it or not. or should I change to android jelly bean? or is it hardware problem?
Greatly appreciate for your help.

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[paul_gyver]

Your contacts should be tied to your Google account. Did you freeze contacts app? Are you signed into Google and is sync contacts checked in settings?