find date of leaving property

hi we are being pursued, for £20,000 from drydens, we had a mortgage with kensington a firm in london, we handed the keys back, in 1990 or 1991,how can we find out the exact date, as it is so crucial. we are being bombarded with letters, i and e, and threatening court action, we have never acknowledged the debt, hope that someone can help us please

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