I thought that the installation fee covers everything that needs to be done, including putting in a quad LNB?
I think that the installer was trying it on.
Section 4 part c) of their installation terms and conditions says:
(c) If you already have satellite equipment installed at your Address, then some of this equipment may be used for the installation and use of your Digital Satellite Equipment. Where any existing equipment needs to be upgraded or replaced this will be carried out as part of the installation. Unless you tell us otherwise, for example because you do not own the equipment, the installer will take away any equipment that has been replaced.
You are going to a multiroom and therefore parts of the current install will have to be upgraded. It’s a standard multiroom upgrade.