I requested a replacement phone for my mom. I called the customer service to activate the phone, which arrived with a SIM card. They weren't able to accomplish this, so I was transferred to technical support. After multiple attempts, they gave up and said that the SIM card has a problem, so they will send me a new one. I called them back after about 10 days, to find out that no card was issued to me. They repeated the attempts to activate the card I already had, with no success. I was transferred to a different department a couple of times, to hear the same thing again: the card is defective, someone from a different department will contact you within 48 hours. Four days later, no phone calls, I called them back. Same story - someone will contact you within 1 hour, 2 at most.
After a total contacts of 6 times, I decided to file a complaint, I don't see another solution.