I bought a robotic vacuum cleaner in the aliexpress, it was unlucky that it broke down after 7 months, I was told to issue a refund and send it back, I did it, but it took almost a month, I'm waiting for the money, but the operators each time ask for a beeper that I sent them 10 times already, but they they don’t see, then they write down the number on the phone, after a few days I call again and ask the bik to dictate where to file a complaint against them?