He has a right due from a company and got more than his right in complicity with the manager of the company

Q: I had a sum of money with a foreign company operative in Saudi Arabia. It is 4,500 riyals in return for the work I did for this company. I came to them several times to get it, but they refused claiming that the engineer who received the project left the company to another. Thus, I should ask him for this sum. Finally, I went to the company's manager who told me that I should claim a sum of 20,000 riyals and submit the necessary documents for this claim. He also told me that I might give him some of the money or I take it, as this company is unfair. He explained the matter on the documents, and I received a sum of 20,000 riyals. (Part No. 11; Page No. 208) The question is: Is it Halal (lawful) to take the extra sum? If it is not, is it permissible to donate it to charitable project or pay it as Sadaqah (voluntary charity) for the needy? I hope you will give us your legal opinion. May Allah reward you with the best.

A: This is not permissible, because it includes lies and deception to take money in an illegal way. The questioner should ask the company for the sum he deserves. Allah (Exalted be He) says: O you who believe! Eat not up your property among yourselves unjustly You must give back the extra money to the company.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family and Companions.