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check your fluid level, in the reservoir on the left side in the trunk area.
These can be kind of finicky, there are a lot of sensors to detect when things are open or closed, including the safety latches that hold the top down when fully open. It may require scanning the system with a factory scan tool or Ross Tech VAG-COM
Most shops start out with an hour diagnosis- so depending on what the hourly rate in your area, it could be $100-$150 just to diagnose it. There is a switch under that latch area, if you remove the plastic trim cover over the entire width of the front edge of the roof assembly- you might find that the microswitch is loose or broken or wiring damaged.
If you look at the carpet trim in the trunk, there should be a round rubbery plastic circle- take that out, and there will be a t-handle behind there. That is on the pump, so if you remove the trim around that you can access the reservoir for the fluid. It takes hydraulic pump oil.