Dealing in interest
Q: Is it haram if someone makes a contract and in the contract it says that they will give someone something for free, but it also says in the contract that if the person that gets the free thing breaks the terms and conditions of the contract or cancels once the free thing that is being given starts to be installed then they will be asked to pay for it and also if they break the contract and are asked to now pay for the free thing and they do not pay for the free thing when the money is asked from them then interest will be charged on the money they would owe? Is that a haram interest contract to ask someone to sign?
If it is, what should someone do with the money they have made and saved from doing a job that involved witnessing and asking others to sign up to a interest contract like this one? What should a person do if the company they worked for doing this for are due to pay him money from past contracts that the person signed others into?