I called back number (07) 5512 8672 reached voice mail for Wyndham Destinations.

This is a nuisance caller who, after you've blocked the number, keeps changing the last 3 digits of their phone number and calls you again and again. I don't know who they are as they never leave a message - a hallmark of scammers/spammers. I have traced them to Beaudesert, in Queensland and they use the large number range with the pattern of:
07 5512 8xxx.