I have cancelled about 100 tickets both within the 24h window and fully refundable Plus tickets. Only once was my "refunded" ticket NOT paid back to my credit card which I had to chase, otherwise always automatically refunded, albeit with a very varying pattern, sometimes in a couple of days, sometimes 20 days. That's why I started to keep an excel where I track all my refundable tickets in columns such as bought tix, cancel date, refund date, check bank account date. Just to be idiot proof