I am highly disappointed by the O2 service in Prag...

I am highly disappointed by the O2 service in Prague. They don't pick up the phone when you try to call to any store. I needed a simple information (customer service line couldn't help me with that) but I had to go from store to store to ask. I made perhaps 20 no-answer phone calls in 3 days to 5 different shops. I wrote 3 emails with no answer as well. Why they bother to state a phone number and email with the store description I will never know. Totally useless.