[Brent] Update garden waste extra service text

templates/web/base/waste/services.html

@@ -52,7 +52,7 @@
           </form>
       [% ELSIF c.cobrand.moniker == 'brent' AND NOT is_staff %]
           <p>
-            If you are looking to add another service, please contact our customer services team on 020 8937 5050 who will be able to do this for you.
+            If you are looking to pay for another garden waste service, please <a href="https://customerportal.brent.gov.uk/contact-centre-anonymous/cc-enquirytype-anonymous/?sid=4933b2f4-dc86-e911-a8f4-00224801ab35&sname=Waste">contact our Customer Services Team</a>.
           </p>
       [% END %]
       [% IF c.cobrand.call_hook('waste_garden_allow_cancellation') == 'staff' AND is_staff %]