Samsung - 3 times charging issue in 1 year

I brought my phone on ** th of August **** it was under warranty of * year In the moth of may it faced charging issue. I took it to service center in Delhi. I even brought a new data cable for *** rupess. Even after being under warranty I had to pay **** rupess me being a student that amount is a huge deal for me they changed the charging port and gave it back to me, I even extended the warranty of my product fearing that i might face the issue again, after * months I faced the same charging issue again I took it to service center. They kept the phone for a day and after fixing the problem returned it back. After two months that is on the **th of Nov I faced the same issuw again. In one year I had to take the phone thrice to the service center. I'm a medical student with all my important study material in phone amd sue to COVID-** we we're having online exam i cannot afford to go to service center every two months. Please help me out