CPC goes up after raising the budget

I wanna run a campaign for likes and intend to get it for 2 cents/like. The problem is, after spending much on testing and finally getting it for 2 cents, whenever I try to increase the budget the CPC goes up as well. What can I do to avoid this and maintain the CPC after raising the budget? ...

Pallavi
The best you can do is to start a new adsets . with a new budget. Let it run until it has the same results , or increase the budget every 2-3 days in small augmentation ($1-2 per day) so Facebook adapts before ruining the data and CPC.