The only time I think they would have to send a tech for TV would be to bring a box or remove a trap on the line or add an extension.
To upgrade internet speeds I would call just to be safe. They can do it over the phone no big deal, unless you need a new modem
As for a service call for upgrades, flat out tell them NO, you will not pay for the priveledge of upgrading so you can pay them more per month. Absolutely ridiculous they would charge you for an upgrade that results in a higher monthly price to you.