Hi last month I called to arrange for a promise to pay and the date I said was for the 30th but I see I'm getting emails to say I got a payment due

Hi last month I called to arrange for a promise to pay and the date I said was for the 30th but I see I'm getting emails to say I got a payment due . I did not get paid yet only getting paid on Wednesday then I can settle that balance please change the promise.to pay date .