Byju's — canceled my internship when I asked for leave

Address:

Lda colony lucknow, Lucknow, Uttar Pradesh, 226002

I was an intern of btl marketing group in lucknow i worked really hard for the internship and i gave good performances as well and was really attentive in my work i dint take any leave last month but my salary was deducted for one day but i dint said anything more, during the time corona pandemic covid-19 but one day i was sick and i asked for a leave by calling my manager he said that i should take a permanent leave even when i told him that i am really sick that's why i am taking the leave he just ignored me and canceled my internship and i was working hard from 2 months why would i want to go leaving just a month of 3 months internship please help me sir/mam because i dont know where to contact for help to our hrs.
Please help me urgently