We don't have to prove that the ISS is not real, that would be silly. You must provide evidence that it is a real object that is in orbit around a spherical Earth.
In the face of the abundance of evidence in favor of the existence of the ISS, it is most definitely your burden to prove that it does not exist. You claim that the ISS does not exist. I claim that it does. Both of these claims bear a burden of proof. To the extent that 'proof' is possible for either claim at all, your claim is not relieved of its burden of proof simply because the claim is negative.
The evidence in favor of the existence of the ISS includes personal testimony and experience (from astronauts, their friends and families, engineers who designed and assembled it, mission controllers, etc.) astronomical photographs, technical documents, journalism, congressional oversight, and, most importantly, the thousands of radio hams who have personally tracked and communicated with the ISS.
How to be successful with the ISS Packet Personal Message SystemISS Ham Radio ReferenceAmateur Radio on the ISSThe point of these sources is to prove that there are well-defined, well-understood methods for observing the ISS that, unlike photographs, cannot be faked. Even if it could be, you don't have any evidence that it is. You don't have any evidence at all to support your claim.
Search Google and Youtube and you'll quickly find hundreds of recorded ISS contacts.