Poor service and plenty lies

I placed an order on IG's website on 22 March 2019. I was advised that delivery would take place within 4 to 6 days to date, it has not been done. For me to get to a point of placing this order, I had to send 2 complaints to IG requesting my free voucher as per the contract that I had entered into with them. I entered into the contract via telephone in October 2018. I queried the voucher in December after which I was told that it would be sent via SMS after the successful 4th debit order. In this case it was meant to be in February 2019. I sent another email in February as the month was coming to an end with no voucher received. The consultant who assisted told me that the voucher had already been sent in December of last year. The lies or misinformation are annoying and now I'm waiting for an order that is out of SLA.