Worst customer experience I've ever had

The last few days have been the worst I've experienced with any isp.. I purchased a Mitchells Fibre voucher on Thursday already and still haven't received my voucher. After 2 days of endlessly trying to prove I've paid for the voucher, I now here I must wait until the following Monday because the partment that generates vouchers is closed. This is pathetic. It's sad to see how paying customers are being treated. I was promised a call back by the manager which ofcors never happened and Mitchells Fibre keeps telling me that the problem lies with mweb. So a whole lot of blaming taking place and all I've been told is "I'm sorry for the inconvenience"