Quote auto increment not working

Hi, I have followed the instruction downloaded the 2 plugins and paste the below code into the Contact Form 7. But when I submit the “request for quote” from the form which I have added the shortcode to one of the page, the auto increment quote number is not working. it stays at QUO-0001. But it works on the admin page. Please help.

<p>Your Name (required)<br />
[text* sliced_client_name] </p>

<p>Your Email (required)<br />
[email* sliced_client_email] </p>

<p>Website (required)<br />
[url* sliced_client_website] </p>

<p>Business Name (required)<br />
[text* sliced_client_business] </p>

<p>Address<br />
[textarea sliced_client_address] </p>

<p>Any extra Business info<br />
[textarea sliced_client_extra] </p>

<p>Overview of work required (required)<br />
[text* sliced_title] </p>

<p>Description of work required (required)<br />
[textarea* sliced_description] </p>

<p>[submit “Send”]</p>