Terminated on 30th day of my work

Hello der, i was working for a company as sales advisor joined them on 16th may 2020 , for work from home proposition meanwhile till pandemic , it was mentioned in my LOI that i will have to go through a training module for 2 weeks , post then assessment will be done and if i pass the assessment will be an employee, and will be eligible to be paid since day one , we agreed, after 2 weeks of training they said lets postpone the assessment and go on dialing for 8 hrs and for 12 days post then will be assessment , and said ww will be paid even if we fail for the number of days we dialed, we all started many of us regularly hd electricity or internet challenges which we regularly updated them, however assessment done on 14th june 2020 Saturday, and told Monday results will be out , Monday they called and said that i have done reasonable but they will like to see more of me for 1 week and then again an assessment, neither failed nor passed, same day i was feverish and went to see the doctor for checkup, doctor suggested i should have covid -19 checkup, i went for that following day forgot to tell them since morning as was in bad shape however after visit from doctor saw whatsapp text and my trainer said not to login and call him or the manager, i texted him that just rchd home will call , his reply you are fired, 16th jun 2020. i am writing this on 21st jun 2020 evng 10 pm , not rcvd termination , letter yet, called hr very same day she aksed for 24 hrs , waited no response , again texted she said , hr boss will call, no one called , then i emailed them the-entire narration and how badly was treated and humiliated by manager and situation, on 20th june at 5.30 HR boss called me and was pinning me down on my calling number and inability i recorded the conversation, she said trainer fired you on frustration, offered me 15 days salary, i dint accept she said to do whatever i can raised question of my termination letter she said she forgot and will send later, plzzzz all you learned lawyers and consultant plz help me in bad shape