for working a captcha case sensitive you will have to do following changes in following file
file
/catalog/contact_us.php
line number 81
if ( isset($_POST['visual_verify_code']) && tep_not_null($_POST['visual_verify_code']) && isset($code_array['code']) && tep_not_null($code_array['code']) && strcmp($_POST['visual_verify_code'], $code_array['code']) == 0)
replace this code by following code
if ( isset($_POST['visual_verify_code']) && tep_not_null($_POST['visual_verify_code']) && isset($code_array['code']) && tep_not_null($code_array['code']) && strcmp(mb_strtolower($_POST['visual_verify_code']), mb_strtolower($code_array['code'])) == 0)
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