Hi Katerina.
Maybe i can help with GoBetwino.
Important stuff with GoBetwino is:
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Configure serial port in the settings menu, make sure you are using the correct serial port, and the same Baud rate as setup in your Arduino code.
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Do not use GoBetwino and the Arduino IDE serial monitor at the same time, this won't work.
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Read the "How to use sample code" document. It explains how to use the XL sample. Try to get this code to work first, this will give you a good starting point for using GoBetwino with your own project.
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Feel free to ask any questions in this thread, i will follw it.
EDIT:
When sending data to Excel from Arduino, with GoBetwino try not to send data too fast / frequently, GoBewtino and Excel needs a little time to handle the data.