I understand perfectly.
You bought a device with a warranty (usually a year)
18 months later there was an issue with a pink/purple screen.
You contacted support who advised the device is out of warranty and offered to arrange a repair at your home. The call out cost would be £75 and, before the engineers saw the device to investigate the issue, an estimate of £180 was provided to give you an idea of cost (presumably to replace the backlight if required). The Support Agent on the call would not have been able to 100% be sure what the issue was so was trying to be helpful to give you an indication.
At it happens you then received a software update and that resolved the issue. Happy Days.
So yes, for a device out of warranty, a call out fee is standard across the world. In this case, £75 advised. Try calling out an electrician when there is an issue with your electrics that you yourself can't fix and needs investigating. They will almost certainly charge a call out fee, same as a plumber by way of examples.
So as your device is out of warranty, a call out was offered but ultimately wasn't needed as a software fix came in in the meantime.
YES I DO UNDERSTAND AND SUGGEST YOU TRY BEING A LITTLE MORE POLITE. THIS IS A CUSTOMER TO CUSTOMER FORUM, YOU ARE NOT TALKING TO SAMSUNG STAFF HERE AND EVEN IF YOU WERE, BEING POLITE GOES A LONG WAY.
I am not employed by Samsung nor do I receive any remuneration as a Samsung Members Star.
My device is an S25 Ultra.