Unhappy customer

I borrowed money from KND finance and one month I missed an installment he came to my work place to collect so I made an arrangement for month end with him. He came to my work place before month end as he came i was leaving to go to the shop he asked if i was running away from him. I told him i have no reason to. He went to my colleagues to say I owe him money I borrowed money from him now I'm running away. What happened to confidentiality? To top it all I did not borrow money from him. That is very unprofessional