Discovery Miles not provided for online purchase

I bought an item online with my Discovery Virtual Card from Babies R Us in Feb and should have received 43.5% back in Discovery Miles. I noticed in March that I didn't receive the Miles back for that purchase so I queried and provided the receipts. After over a week I finally got the Miles but I noticed that it was only 25% back. I queried again and was told that it was because I didn't use my Discovery Card, which I had. The agent then said they would rectify. After a while I received feedback saying that Discovery couldn't find a transaction from 24 January on my card so the matter is closed. I had to then open up a third ticket to query and say that the purchase was made on 24 February (not January), which was clearly visible on the receipt. I sent through the receipt again and a screenshot of my card statement to clearly show that I had used my Discovery card for the purchase. It is only another 2 weeks later (despite being told 3-5 days) and apparently this is still being investigated. I can only imagine that Discovery is stalling to make sure that I don't get my Miles before the 15th of the month when Miles are worth 30% more.

I can't understand the calibre of people working at Discovery to find this simple query so complicated.