Money incorrectly allocated to another account or ******, i dont know

I'm beyond frustrated. I feel so angry and in turmoil with this bank. My sister sent me money via the Capitec app using my cellphone verified with the bank. I never received that R1250,went to the bank to enquire and I was told I am sharing the number with the other client of them so my money went to their account. I was not in any was assisted on how will I get the money. How is it possible that the bank could not pick that seeing that the number is linked to the account number which is supposed to be unique. I am left in hunger and no food because that money was meant to buy food for the family. Capitec please I need my money