Different conditions in bond paper and offer letter how can I resign

Hi, I have joined a company "x" and according to the bond that i signed, it states that if i breach the bond during or after training period(3 months from date of joining) i will have to pay some amount. But, according to the offer letter which they have signed(without any notary, just casual sign between me and the HR, though on the official paper) i am given role of intern for 6 months from the date of joining. So right now I am in intern period according to the offer letter which i signed before joining the company. If i intend to leave the company now, will i have to face penalty?