Vodafone — Porting request not fulfilled

Hi,
There has been zero network coverage in my office for vodafone and data services are simply not working beyond 100 kbps speed, hence i have been trying to port out my number [protected] but every time i send a port request to 1900, i get this message "upc cannot be generated for the reasons: (1) there are subsisting contractual obligations with your service provider."

Please help me out to get the port code. All my outstanding bills are cleared as of today.