Service tax and vat on a product

Hi ,

We sale licensed softwares to our clients and apart from it we provide repair and maintenance services of that software.we charge both VAT and Service tax on bill amount.

Now my client is not willing to pay both service tax and VAT,asked us to charge any one tax only.what are the remedy's we have ?

What are the consequences of not charging those taxes by us.

Pls explain....