Hello.
That doesn't sound good, although having some one else sent you a one time password isn't much use. The passcode needs to actually come from Three to be of any use. If you're receiving the codes, you shouldn't ever share them with any one unless you're absolutely sure you're speaking to Three.
One tactic that's been used before is for a caller to pretend to be three, while also attempting to access the Three systems themselves, they then ask you for the code that was generated on the genuine Three system, and giving up that code is what usually where the problems start.
It's best not to entertain the caller of if you're unsure, and contact Three directly to find out if it was indeed Three, or just a spam caller.
Pete.
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