please contact me regarding my refund. it's short.

Ola, I don't know how to make contact with the hellopeter group except to post here. I have received my refund, thank you, but according to my calculations, it is some rands short. I was waiting for a second refund as the items were cancelled in 2 emails, but the 2nd refund never came. Please could you contact me and go through the refund with me so i can see how you arrived at the amount that was refunded? Many thanks.