Damaged similac gold comfort

I bought similac gold comfort number 2 on Wednesday around my lunch time, I was at clicks kerk the one close to Bankcity in Johannesburg, I got a shock of my life when I was preparing milk for my son and it was at night., the package was not sealed at all and the tin is damaged.. I spend more than a 1000 on my child's milk every month, getting a damaged packaging especially milk I was very dissapointed and how sure am I that it was not tempered with.. the sad part it was the only milk I had to feed my son..