Refund

I bought i computer from dell over a month ago and they delayed my order three times so i decided to cancel the order. After i cancel the order It says i should receive a refund in 5 business days and i haven't received it i've been in contact with dell and my bank and my bank says dell hasn't tried to give me refund and when i called back to dell they said they were handling it that was over a week ago and still haven't heard a word back and I still haven't gotten my refund.