A319 Captain reported aircraft refusal due to an MEL that deferred a computer that controls operation of spoilers and elevators

Narrative

Upon arrival to the aircraft reviewing the logbook; We learned that the aircraft had a deferral of SEC one (Spoiler Elevator Computer). After complying with the MEL Operations section; there are warnings to not use the speed brake in flight. I consulted the Dispatcher and told them that I was refusing the aircraft due to this limitation. A few minutes later; I was called by the Dispatch Duty pilot. Who asked me why I was refusing the aircraft when it's a legal MEL? I proceeded to tell him that I did not feel like it was safe. I gave him examples of procedures such as an emergency descent that requires use. He asked me if I would be willing to talk to tech so they could assure me that it was safe. I told him I was not going to change my decision. He said OK and hung up was then called by my base Chief Pilot who also asked me why I'm refusing this aircraft. I told him in the interest of safety. A few minutes later; I was called by tracking and told that I was given a missed Trip and was being removed from the flight because of my refusal. I immediately called my Chief Pilot and told him about the missed trip and he said he would have that removed. However; I would be docked the pay for the trip because I refused an aircraft with a legal MEL. I felt harassed and pushed as they were trying to get me to change my decision of refusing the aircraft. Cause: The MEL seems to not coincide with our procedures for an emergency descent.Suggestions: Not having an MEL that prohibits the use of a flight control surface necessary for our procedures.