Stinking service from MTN

I'm a prepaid customer and I bought YouTube bundles. The bundles are not working, and I'm told that it is because my number still appears as contract. I also bought Facebook and whatsapp bundles and they are working without any hassles, but the YouTube bundle doesn't work. I asked them to refund me since their bundles are not working, they're telling me it's impossible, and with stinking attitude. Sies MTN.