Poor experience with Comptia experience through Rosebank

I purchased an exam voucher in 27 March. For a Comptia A+. I was supposed to get my voucher within 24 hours, but it's been two weeks, I keep getting referred around, my calls always get transferred and hung up on. However they had no problem letting me know via email, that they received my payment. I would like either my voucher or a FULL refund, because to this day, I still haven't gotten anything for what I paid for.