Maybe count your losses and be prepared to buy a new IPTV sub should you loose it for some reason. If you backup your settings then the bouquets are safe.
There are so many ways the IPTV could have been added we could be here all day and may still not find out how they were added.
Some IPTV providers have plugins, others use e2m3u2bouquet, others use a script you copy and paste.