If you call 3 times a day for 4 days, you'll reach the 12 attempts. Call first thing in the morning after they open. Then again around noon. Then finally a couple of hours before they close.
When you call, you can ask things like, "Is there a washer and dryer in the unit?" After they answer you can say, "Ok, I'll call back." Or you can do the same thing and ask if they accept pets. Also, you can purposely ask for someone else so they'll tell you that you have the wrong number. Finally, make sure you disguise your voice each time.
I hope this helps.
Sincerely,
H.A.R.D. at work