WebAfrica cannot calculate a calendar month

We are trying to cancel our WebAfrica fibre line as we are moving house but do not have a new residence as yet (or we would be moving the line instead) and are letting WebAfrica know on 1 May for cancellation as at 31 May (1 calendar month).

They are arguing with us that the service will only end at end June - that is 2 calendar months (May and June).

The cancellation policy on WebAfrica: You can place your notice of cancellation one calendar month before the date of cancellation via your Customer Zone or if it falls in the last week of the month, with one of our friendly agents.

Google any definition and the result is the same: "The beginning of any given month to the end of the same month." ie. 1 May to 31 May. I would understand if this was any other day in May but it is not.

If WebAfrica is incapable of calculating a calendar month, perhaps they should indicate their cancellation policy in business days instead?

I have always had incredible service from WebAfrica but this is making me doubt if I want to sign up with them again when we do find a new home.

Please investigate and provide feedback soonest.

Yours sincerely