Trusted phone number cannot be changed

So,I am dealing with this for three months now,first I forgot my password, I tried to change it and enter my account with trusted phone number and that is where my troubles started.Somehow two diel up codes appeared in my trusted number,I have used it several times before and it worked fine.Now,with two numbers I could not get my verification number.So next I asked to change the trusted number and recover my account.I added my number without country diel up code,in a month I got a massage on my phone that I can verify my account now,I go to account verification and still it asked for the previous number,the one with diel up code.I am guessing that the trouble started when I registered,there was no option for my country,so I registered another one,and added diel up code for my country,it worked fine.Now there is option for my country and two diel up codes appear on my number.It cannot be changed,tried twice.There is no one to contact,no one to write to,no one to call,how is this support I have no idea.