Corel company reseller are threatening us for taking licence

15 days ago, a corel reseller came to our shop and see the licence of corel. Although we are using pirated version he started threatening from the same day. He give verbal warning to my father that within 7 days you have to purchase their product @70,000. For my father it was really shocking. Next day a lady called my father and start shouting at him. She treat my father as a criminal. Just because she is a lady my father won't say anything. After 7 days when they didn't receive any response from us that lady started calling daily. For a middle class people it is very difficult to manage 70k at a time. We agreed to pay the amount but after Diwali. Now they are calling us and saying that after Diwali amount will get increased, after that you have to pay 73k. Sir, I am not getting on what basis they keep on changing their product rate. If a person get full feature on pirated version then why should anyone purchase their product. They first ban all these beside that they are tourching people and forcing them to pay the amount at any cost. Sir please suggest me, what should I do