I see the bug in 

https://bugs.launchpad.net/ubuntu/+source/mobile-broadband-provider-info/+bug/382664 

and I decided to help. So i create a patch following the instructions and send you the diff. Actually two issues was fixed:
1. I see that there is two <providers> for GloBul so I remove the obsolete.
2. I add the missing Vivatel provider.
3. Now the database is fully updated and checked it works for Bulgaria (only 3 providers here). 

Please update this as soon as possible, thanks. Happy to commit.

Index: serviceproviders.xml
===================================================================
--- serviceproviders.xml        (revision 95)
+++ serviceproviders.xml        (working copy)
@@ -461,13 +461,13 @@
                <dns>213.226.7.35</dns>
        </provider>
        <provider>
-               <name>GloBul</name>
+               <name>Vivatel</name>
                <gsm>
-                       <apn>internet.globul.bg</apn>
+                       <apn>internet.vivatel.bg</apn>
                </gsm>
-               <username>globul</username>
-               <password>[none]</password>
-               <dns>192.168.88.11</dns>
+               <username>vivatel</username>
+               <password>vivatel</password>
+               <dns>192.168.123.123</dns>
        </provider>
 </country>