Question

correct these sentences

Which store did you bought this device?

Please return the phone within 14 days,

Please look out to notes to get the detail.
 
Since when has phone been malfunctioning?

Does the reps know about the information?

Answer 1

Which store did you buy this device from?
Please return the phone in 14 days.
Please look out for notes for further details.
When has the phone started malfunctioning?
Do the reps know the information.

Answer 2

Which store did you buy this device?
Please return the phone in 14 days.
Please look through the notes to get the detail.
Since when the phone has been Malfunctioning?
Do the reps know about the information?