Vodafone — Harassment from vodafone for bill payment

Address:

530017

I had used my number [protected] in International roaming. Vodafone billed me approximately 18000/- for my usage while my credit limit was only 8000/-.
When I called them and asked them how could they allow me to use such a huge amount over my credit limit without even informing me, I was promised twice that this entire amount will be waived by Vodafone representatives. First time it happened on the 30th of Mar'16 when I threatened to escalate this issue to the media, I got a call on my other number [protected] that this amount will be waived.
When this did not happen, I called again on the 23rd of April'16 and spoke to a girl called Bhavani and she also promised me that this amount will be waived.
I have been getting a lot of calls post that and everyone has assured me that this will be taken care of but nothing has happened till date and now they have sent a demand notice. I had hoped for a peaceful and amicable resolution on this but it looks like Vodafone is hell bent on taking it the legal way.