HALP DARK HAIR TURNED RED

I HAVE NATURALLY DARK BROWN CURLY HAIR, I AM SPANISH SO IT IS ALSO SOMEWHAT COARSE. I HAD MY HAIR HIGHLITED & THE COLORIST WENT NUTS & MY HAIR TURNED OUT BLONDE! I NOW WANT MY HAIR BACK BRUNETTE. I WENT TO A SALON & THEY DID IT BUT IT CAME OUT DUE TO THE SUN AND NOW IS AN UGLY REDDISH BRASSY COLOR. I HAVE SPENT WAY OVER $500 ON MY HAIR IN THE LAST 6 MONTHS & SIMPLY CANT AFFORD TO GO BACK TO A SALON. WHAT IS THE EASIEST WAY TO GET THE RED OUT? I REALIZE I WILL STILL HAVE HIGHLITES DUE TO THE BLEACH ALWAYS CONT. TO BLEACH BUT CAN I COLOR MY HAIR W/AN ASH BROWN COLOR TO NEUTRALIZE THE RED? I HAVE HEARD OF FILLERS, SHOULD I USE THESE B4 I COLOR?