I have a contact in my list whom I have deleted multiple times, but they aren't staying deleted. I use skype on my desktop computer, laptop computer, mobile phone, and Android tablet. I'll delete this contact on one device and log in on another device shortly after only to find the contact has returned to my contact list.
I've also tried blocking them. They will remain blocked on one device, but when I log in on another, they're unblocked and back in my contact list.
Any ideas on what's going on or how to permanently remove this person from my contact list?