False negative?can the tests be wrong

i went to the gynie, they told me that i have chlamydia, so i got it treated, then i had unprotected sex with the same person who gave it to me the first time (my boyfriend) then i got treated again, got it back and once more got treated then got it back...because i had unprotected sex with him, and he has never been treated for it. I went back to the hospital to tell them i have it back because i have the symptoms of it, and i wanted to get it treated and this time i took him with me, so i wouldn't get it back, they told me that when i went to the hospital last time, that my test came back negative, but how can i be negative for it, if i had unprotected sex with the person who gave it to me, and they were never treated for it? & i have all the symptoms of chlamydia, i've had it like 3-4 times within 5 months , i know the symptoms. and for them to tell me i don't have it i don't know whats wrong, and they won't treat me because theyre saying i don't have it. if i didn't have it why would i have the symptoms of it? PLEASE HELP ME. can they test be wrong? and i do have it, it's just not showing up somehow? PLEASEEEEEE HELP