You most likely don't properly clean your system, didn't use a new proxy or something like that, 90% of accounts being banned are the result of such issues and other of 10% coupon accounts are banned just randomly. If you need coupons then I can sell them for $1.
I would give you one but your home country states India. Sorry for the delay. I was travelling the Alaska highway. Spent a few days at Laird hot springs. I still have coupons for legit customers. Putting a stop date on your campaign ensures your credit card will not continue to be billed after your free Google money runs out. Of course if your campaign is going well, you do not need to stop it. Your choice. Checked out a gold mine operation on Gold bottom creek, Dawson City, Yukon. One man and wife operation. They did about 200 ounces this year. They spend winters in Mexico. [video=youtube_share;MCp1gXbIq1M]http://youtu.be/MCp1gXbIq1M[/video]
I do prefer google but by adding payment details instead of using vouchers which lead to a ban or suspension of the account.