Also got this message along with an email at the same time, pretty worrying but clearly a scam. Don't reply if you look up amex actual contact numbers on the website are different

Westpac confirms this is a scam text - do not reply.

I got a msg saying my amount on my Amex is $2700. I don't have an amazing card went into the bank and they said this was a scam!

American Express Scammer. Dont reply to this number.

had a text same. says from Amex warning of possible fraudulent activity on card but not my current card number.

AMEC account scammer dont reply to this number

says its from American express about a old card