If this were true, the whole of humanity is polytheistic. You should study the verses of the Holy Qur'an so that you may know what is true and correct. Admittedly, it was unusual, and the Prophet Solomon, despite his knowing that it required divine power, did not ask Almighty Allah to bring the throne but asked mere creatures to help him. This fact shows that seeking others' help is not polytheism. Allah, the first cause, is the Creator of the causes of this world.
Polytheism is a matter of the heart.
If a man asks for someone's help and does not consider him Allah or His partner, it is not forbidden. This situation is common everywhere. People go to the houses of others and ask them for help without taking the name of Allah. So please be fair and do not misconstrue facts. The whole Shia community believes that if anyone considers the descendants of the Prophet as being Allah or partners in His Self, he is surely a polytheist.