Custom conversions in Binom or Keitaro

I worked with this person, promised to complete the task on setting up Keitaro, misunderstood the task and wanted to set up postbacks for 5000 UAH, said he would do everything, after he reread the task and wanted to do everything, not as it should have been, promised to consult with colleagues and respond, he consulted with colleagues for over a week and of course did not write anything to me, when I wrote and said that I would reject the task, the person agreed without any words. Today, when I started rejecting the task, I saw that the person deleted all our correspondence in Telegram. I do not recommend working with them!