It would have been better for the customer to send him part of the amount agreed upon before publishing the promotion and the other part after he promotes the product, or for this transaction to take place through a third-party site such as Fiver or Upwork in order for everyone to guarantee their rights. Unfortunately, there are many scammers who have verified their accounts On Instagram and on social media sites to scam people, so the verification mark is not a measure of a person's integrity and credibility. We should not trust anyone, no matter how many followers he has, because it may be that these followers are not real or bots, and he is exploiting these numbers of followers in order to make people trust him.