2 step authentication not sending code

Hi, I'm trying to purchase an item using Zsilver and it's asking me for a code sent to my phone, but I'm not receiving anything, I tried going to my account and changing to enable using my phone, but ask for the same code that never arrives on my phone, anything that I tried on my account ask for the same code. I tried contacting the support on the chat, but they dismissed me saying that problem with gold or silver I have to send a ticket, great help no one seems to answer, now my silver gonna expire in 6 days and I won't be able to get what I want, Can someone here help me with that? Thank you