he is defamed

This person is slandering me for something that is not true I sent the payment and he arrived I was detained for 21 days and I returned his money since he could not wait those 21 days for the account to be released and he wanted the account immediately, I did not have the money available and he returned his money because it was fair if I did not have the money available he had to wait and since he did not want to wait I gave him back his money, I asked him if he could make family and friends and he accused me of swindling just because I asked him if I could do that, if he was not comfortable I just had to say he could not, he does not have to defame me, apart then he wants to sell me his supposed account that is better than mine and does not even have positive feedback after I asked him if he had positive feedback and his response was affirming that if, if they can see it does not have any feedback, it is clear that the one who is acting wrong and lying is the.