Bayport Financial Services refuses to pay me back my money that I over paid to them.

I was paying my debt to Bayport Financial Services through CCDC(Customer Care Debt Counsellor). I ended up overpaying the debt over a period of about 4 years, since 01-11-2015. On the 24th of February, I spoke to Theodora and she advised that the refund will be done within 72hours. On the 13th of March 2020, CCDC requested a paid-up letter from Bayport Financial Services, that shows that I am done with my payments. Bayport then rep**** by saying 'the refund department are in dispute of refunding as the refund is a lot of money.'

So please help me get my money back.