It is important to stay calm in this situation because problems are there to be solved. First of all, check what is on your pay slip: are there any things that don't seem right? Then contact your interim consultant, as they are there to help you! Tell your consultant what exactly is going on.
Next, your consultant will defend your rights. They will contact the company you work for and ask where things went wrong. If it turns out that there was a mistake made by the company, the situation will be corrected. You will then receive an extra payment so that you finally get the money you have worked for.
It is important to mention that you should always remain calm in this situation. Do not get angry or take matters into your own hands. Leave this to your interim consultant. They are there to make sure that everything is fine.