SLACK BUSINESS

I HAD A REFUND COMING TO ME, I GAVE Odwa.S THE ONLY BANK NUMBER I HAVE HAD THE PAST 30 YEARS IT CONSIST OF 8 NUMBERS. NOW HE CAN NOT DO A EFT AND INSIST IT MUST BE 10 NUMBERS. I HAVE JUST RECEIVED A EFT FROM MY SON INTO THE ACCOUNT 10 MIN AGO THE SAME NO GIVEN TO THEM. I CONTACTED THE BANK AND THEY CONFIRMED THE NUMBER. SO WHAT IS GOING ON.?????