Aptech Computer Education — Diploma certificate

I had completed my MAAC diploma ( now under Aptech) course a long time back When I went to collect my Certificate they told me that I had to deposit last 3 month fees slip which I has misplaced by that time due to house shifting, Few months back I found my slips and contacted them for my certificate but they are not at all helping me out I have been requesting them from last 6 months now, I am in a job and I have to show my certificate or I might lose my job which I cant afford as I have lost earning members of my family in COVID .
Please it is a humble request as no one have the right to not give me my certificate no matter after how many years I ask for it