Jose wrote:
The original clearance was an option when it was given to me. It
remains an option throughout my flight. It is ATC's job to ensure that
it remains an option.

**** happens. Weather changes. Navaids fail. Traffic doesn't flow
as originally expected. Airports or runways close down. You need to
accept the possibility that your original clearance may no longer be
available.

Insisting that you MUST be able to continue as originally cleared is
as silly as insisting that a pilot MUST accept any altered clearance.