I've been trying to send a fax to tf collectors club with my details like they asked and everytime I try it comes up with the number I entered being wrong.

This is what I enter, 0015 to open the line for international faxes. 01 for America the country it's going to and then 817-448-9843 the fax number they gave me.

Am I doing something wrong? I emailed them to double check that the number is correct and it is, I also tried 0011 to dial for international faxes because the lady at the post office said it was that number and not 0015 but that didn't work. Any help would be greatly appreciated