University Of Madras — regarding issue of course completion certificate

Dear sir/madam
I have paid my tution fees in my study institute of 603, i went to collect my course completion certificate in university last week, they denied to give it saying i failed to pay my fee. Since the study centre is closed permanently i could not show any proof except the mail i received at the time of fee payment from study centre. The authority says me to pay 6000 to collect my certificate... Just request you to solve my issue as soon as possible.. Thanking you