theme issue please help if you can. thanks

hello every one,

I have an older theme that has an issue.

I have pin pointed it down to 3 files that create the theme and call the function in to play.

the theme is car-rental

the issue is the email does not call right.

———————————————-
can not login with user name and password as shortcode %email% not functioning right.
can not send out emails with %email% displayed as it not retrieving from mysql right
———————————————-

sql query
email
from ‘wp_rc_customers’

Use the following shortcodes:
%title%
%firstname%
%lastname%
%email%
%vehicle%
%pickup_location%
%return_location%
%pickup_date%
%return_date%
%duration%
%total%
%comment%

all but email work.

—————————————————–

Customer: Jeremy cummings
Email: %email%
Vehicle: Toyota Corolla
Pickup date: 17 Apr 2014 @ 12:00
Pickup location: Auckland City
Return date: 18 Apr 2014 @ 12:00
Return location: Auckland Airport
Duration: 1 day(s)
Total payable: $50.00

Your comment: test

—————————————-

any idea how to get it to work again with wp3.8.3? think it worked last in wp 2 versions. great theme if the email function would call right.

for those wishing to see the 3 files I can send them over to you.
they are very basic code so I can’t see why it is not working.

thanks jeremy c.