Hello,
Could you please share existing website address and snap shot of issue. It might be some code or plugin issue. We need credentials/admin/login details to review.
Once we have above details, we will be submitting accurate price and turn around time.
We have strong hands on Joomla.
Check our 200+ reviews at http://www.freelancer.com/u/jkphugat.html and portfolio. We are open to respond on your questions/suggestions before you award project.
I will be waiting for your response and we are interested to work with you.
Thank you,
In kindness - Jitender Singh