COE cancellation problem

Hello All, Let me explain you the situation
1. I had applied for the Japanese Language school in Jan 2020 , in Feb 2020 My CoE was Generated
2. I dropped the idea of going to the school because of personal reasons , I told school about that , they
said that pay the screening fees.
3. I asked them to cancel my CoE as well but they did not cancelled it.
4.I could not pay the fees due to financial problems In November I paid the Screening Fees 25000yen
5.I have got the Job in japan and my employer wants to apply for CoE for Work.
6. I asked the school representative if he has cancelled my COE or not , he said he has not cancelled it.
Giving a reason that there was some documentation remaining.

Problem:
1. The school representative is purposely doing things late and not giving the real information
2. He has not returned my original documents yet , not even the documents of the students whose COE got rejected in february Pre-COVID
3. The reason he is giving that Japan post is not available in India right now

What should I do in this process now? He is not even replying emails , not receiving my calls

Hey, I read your question and I was wondering how did you make it eventually?
I am in a similar situation..

Thanks!