At what point did the word "have" become "of"

[hifimad]

I got a letter from a government department last week and one sentence had the word have replaced with the word of, as i understand it if you wish to become a member of the civil service at the very least you need a qualification in english, i have also heard the of word used in this manner and also the word asked being altered to axed, it seems to me that these are just two examples of the continued bastardisation of the spoken word.

[Haslander]

Since semi-literate, overpaid ex footballer, Paul Merson recites 'of' instead of 'have' ad nauseum when appearing on tv.

[smithy266]

using the word 'only' in the wrong place, giving a completely different meaning...
'different to' instead of 'different from'....
slipping standards.....