Do we ever pronounce "sale" as "sell"?

I'm not a native speaker and I have always heard that "sale" is pronounced "sail/say+l", and "sell" is pronounced "cell". But my teacher who is a lawyer always pronounces "sale" as "sell". He is not a native English speaker either but his grammar and vocabulary is very good and he really puts effort into making sure that whatever he speaks, he says it correctly.

He even spells it out when we're confused, saying "it's SELL. S-A-L-E - SELL."

Solution 1:

The correct pronunciation of sale is the widespread one, viz. sail.

It is hard to perfect foreign accents, especially when you are used to speaking something one way thru out your life. Your teacher is only a human and can make a mistake, don't fret.