Too many Peter Shostaks!

"Snow on Onondaga Road", Peter Shostak, 17" x 29", acrylic, 1977

    This painting was sold to the folks I purchased it from as the work of well known Canadian artist Peter Shostak. I contacted the artist, however, and he confirmed that this is not his work. The painting is signed verso both "P. Shostak" and "Peter Shostak". The sellers took the painting back to the people they had purchased it from to ask for a refund, and they were apparently rudely turned down, even though I sent them the email from Mr. Shostak, claiming they had sold it as his work in good faith, believing it to be a painting by him. The question now becomes did the original sellers sign the work in an attempt to pass if off as the work of Canadian artist Peter Shostak, or were they also duped, or is this work by another artist also named Peter Shostak? I like the painting and the cost was very little, so I decided to keep it and use it as a research opportunity. The painting depicts the Syracuse Mony Towers, as they were then known (now the AXA Towers) as seen from Onondaga Road in winter.
    My initial research showed that there are up to nine men named Peter Shostak now living in the US. I also found the record of another Peter I. Shostak 1913-1989 who was born in New Hampshire, lived in New York state, and died in Orlando, Florida. His WWII enlistment record shows that he had four years of college and was working as an actor at the time of his enlistment. He was the son of Russian Jewish immigrants John G. and Annie Shostak. He married Anna Yaroush on 11 October 1964 in Stratford, CT. There were also several other men by the same name, who were too old to be the creator of this painting. I have not been able to find contact information for the nine living men, but will keep trying. The painting is titled verso. The second seller is from Baldwinsville, NY and the original sellers live nearby. I tried unsuccessfully to find an image of the Mony Towers from this perspective.