Many people use words that are not in any English dictionary (although when a new word comes into common use, it can be added to an official dictionary). Here are some examples.
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Prepone
This is supposed to be the opposite of Postpone, but there is no such word. You bring forward a meeting, not prepone it.
Updation
IT outsourcing companies love this word. The verb “to update” cannot be turned into a noun. Use two or more words to describe what
Softwares
Software is a collective noun, like the weather. It is never plural.
Upto
This word is very popular in India but it is not correct. It should be two words, up to.
Do you know of other examples?