Well prove to me they are not.
I don't know how I could prove it in a way that you would accept. I could give the results of my Google images search for "satellites", literally hundreds of pictures and not a balloon in sight. I could repeat what others have said here about balloons being subject to winds, and thus of no use where a satellite needs to be stationary in respect of the earth. I doubt you would accept such evidence. For example, you try to insist that satellite television signals do not come from satellites, (and that in spite of domestic satellite dishes pointing to the sky), but through cables or even, you said once, by post. What proof would you accept?
Incidentally, I think I may have come across what your picture might have been, which you said was a satellite attached to a balloon. (I may be completely wrong as I am not an expert on these t9hings.):
"High-altitude balloons (HABs) or stratostats are usually uncrewed balloons typically filled with helium or hydrogen and released into the stratosphere, generally attaining between 18 and 37 km (11 and 23 mi; 59,000 and 121,000 ft) above sea level. In 2013, a balloon named BS 13-08 reached a record altitude of 53.7 km (33.4 mi; 176,000 ft).[1]
The most common type of high-altitude balloons are weather balloons. Other purposes include use as a platform for experiments in the upper atmosphere. Modern balloons generally contain electronic equipment such as radio transmitters, cameras, or satellite navigation systems, such as GPS receivers. Hobbyists frequently purchase weather balloons because of their ease of use, low price point, and widespread commoditisation.
These balloons are launched into what is defined as "near space", defined as the area of Earth's atmosphere between the Armstrong limit (18–19 km (11–12 mi) above sea level), where pressure falls to the point that a human being cannot survive without a pressurised suit, and the Kármán line (100 km (62 mi) above sea level[2]), where astrodynamics must take over from aerodynamics in order to maintain flight."