Internship

A small company approached me on Hirect that they are interested in my profile. I went to them in april and they said they will give internship and probation period. I was managing to do in my college free hours. Stipend was very very low. I told that i can't work i am thinking to only focus on studies. I have other offers as well. They incremented some amount and told they will give holidays for exams and all. I found very supportive. My exams were delayed by 15 , curriculum was changed earlier we were given 2 months of industrial training, in this i got one. I told him i can only work for 1 month He told me to commit upto january, ask your teachers whatever you can do. He also asked my teachers number. He told her to make arrangements for me so that i can't attend college. He tried to Bond me. He disturbed me mentally by asking others how they are doing. I don't want to continue. I have all proofs that there was never commitment. He did everything verbally, even not issued internship letter. I provided him letter atleast sign, there was no terms and conditions, nothing. I texted him with all proofs and left. Later he told me " i dont need you, give refund , best of luck for career and dont overestimate your capabilities" I was paid very less, i worked hard, i haven't been given any certificate. Instead he asked for refund, which everyone said it is unnecessary. This incident has took place 3 days ago. I am upset and worried what should i do if he called me again. My seniors and teachers has told me not to worry and stop thinking. I have been paid very less and paid for what i worked. Even by fellows in company told me same There was no terms and conditions, never. I have never signed any kind of this.