Opel Astra H Twintop Hardtop will not open

My Opel Astra H Twintop has a problem with the hardtop.
When I push the button for opening the roof , it beeps three times and nothing happens.
When I'm driving and pass over 30 KM/H , it starts with the beeping again.
The vehicle , spent around a month at  Opel dealership , but they was not able to identify the fault , but made me pay for spending time trying to fix it :( What a joke ! I felt like my car is a hostage there and I'm paying a ransom.