Complex sentence: "I do not know when it is going to change"-that's what you will probably hear when calling their Customer Service Center and they will offer you to write a complaining message to their Technical Department which does not respond to any problems at all.
Split into simpler sentences: I do not know when it is going to change-that's what you are likely to hear when calling their Customer Service Center. You will be offered to write a complaint letter to their Technical Department which does not respond to any problems at all.