No I wouldn't just delete it or ignore it by responding the person might think they are talking to the person they ment to send it to or they might just be sending random emails to everyone (Don't respond I wouldn't)
Should you respond to a text message that was wrongly sent to you by someone you don't know?
Personally, I would, but it's probably not safe because well, it might be traced and you never know the creeps that are out there..
Nope,delete it.
Depends how personal it is if it's small just play along
No, I would delete it straight away and just forget about, as you never know who it could be from.It could be a genuine mistake or it could be spam or something more serious like someone trying to stalk you and get further details about yourself.
I would just say, I think you have the wrong phone number and don't worry about it.