Job resignation within probation period

Sir I applied in a firm for a job through naukri.com where there was no description of job training cost and compulsory period serving, I got selected and all the joining process was done in a rush not even the time to read the joining letter was given to me and as a security a blank cheque was taken from me. I signed the joining letter but gone through in a recap which comprises a 15 days probation period and there after I have to serve for at least 1 yr and after that if I wanted to leave I have to give notice of two month otherwise I have to pay the training fee along with 2 mth salary to the firm. They said that at the moment we don't have bond so we will get it signed after few days. They dint even gave me a single document. The very next day was my joining I went there and jointed but at the end of the day I went to the senior and asked about the serving bond along with blank cheque query. They confirmed me that it was there. So the second day I approached the hr and said that I was not told about the 1 yr bond and training cost nor about the blank cheque.so I am not agree to continue further.so plz return my cheque and set me off from all this. I am in a 2 nd day of probation period of 15 days. Kindly suggest what to do next. Legal obligation on me if any. I am thinking of giving a resignation letter the third day so I will have a Prof that I have done that. Bcoz now they are saying come tomorrow come yesterday.