guys i have said many times aleady in my previous posts.. celcom has lots of billing issues.. the worse thing is you cannot ask for rebate easily.. need to write in and wait for months for bureacracy to get it approved.

Maxis very easy , their Customer care can give u rebate right away, and they will even honour the false promises made by their agents.. (which will later be blacklisted - so most of Maxis agents very careful)