Australia's Xamble at 21-week high on investment by 7-Eleven Malaysia's unit

** Xamble XXGL soars as much as 50% to A$0.03, highest since July 17

** Influencer marketing platform secures A$1.5 mln ($955,200) investment from 7-Eleven Malaysia's SEM unit

** Says will use funds to scale operations, expand offerings

** Stock posts biggest intraday pct gain since July 17

** Around 138,877 shares traded vs the 30-day avg of 72,909

** XGL down 67.2% this year, as of last close

($1 = A$1.5704)