A kazang voucher refused to recharge my account.

Yesterday, I purchased an internet voucher that didn't recharge. When I called mtn, I was given a kazang number. Kazang told me to WhatsApp them the slip. They still haven't gotten back to me. When I went to the Somalian seller, he refused to refund me. I just left it there. I shall never ever ever buy kazang ******* anymore.