Lido Learning — Refund and cancellation of EMIs

I enrolled my son in Lido learning on EMIs. In the month of October on 5 I applied for refund and it is approved on 25/10/2021. But they are not refunding the amount. Every month instalment of 5013 is deducting. And they are lingering on the process. First they it will be done in the month of November then in December. Now saying in the month of January. They are just giving months every month. Mostly they are not picking up the call. It's very difficult for me to pay instalment every month. They are cheating people. They cheated me. My son has not attended even a single class and still I had paid 5700 in the beginning and two months instalments if 5013. Total 15713 they have already cut now on Jan 2 again 5013 will deduct. Please help me what is to do. I think I have to go for legal notice.