Query regarding hike in salary

Hi, I joined a private company 3 months ago. In my earlier company, my salary was 45,000 and In my recent company,At the time of interview I demanded the salary 52 +. They said that right now they can't pay this much and asked me to join on same salary 45,000 and made me assured that after 3 months the salary will be hiked by 48,000 and can be more according to my progress. So , I joined the company at 45,000. Now after 3 months, Company is saying that they are not happy with my progress and can't give me the hike. I discussed my concern with HR but no results. So, please suggest me that what can I do ?