As terrible as possible!
Support doesn't work at all. I've cancelled my contract on the internet 4 month ago through the app and they still send me the bills!!! If your contract support in the live chat, be ready to wait for answer for 16 minutes and more! I write to the support in email and they still didn't help me. It's just impossible to cancel the contract. I also contacted them in Facebook and no one replied me already a week!