Cancellation of Order with no Notification/Reason

I placed an order on 3 December for a book. I ordered a cheaper item along with it as I was making use of a voucher. <br> <br> I received a notification that the cheaper item was in transit shortly after I placed the order. I logged in to check, and I noticed that the book I ordered was cancelled and I had a credit to my account. The credit however did not include the voucher I used. I checked my email (as well as my old email) for any notification as to why this item was cancelled, and I found nothing about it. Basically, if I didn't login to my account, I would be completely unaware about this. <br> <br> I emailed takealot twice to complain about this issue, and have received no response. I also logged onto the website to fill in their contact us form, and still no response. This is actually the worst service I have had from takealot to date. <br> <br> I also tried a checkout today to see if I can use the code from the above mentioned voucher and it is now invalid.