excess & wrong billing and disconnection of number

My problem started when I had purchased a new handset and converted my self from Blackberry to Android. I am giving below the list of incidents which will say how much was I harressed by Vodafone The number on which the problem happened is +919831312789 1. I was using Blackberry till 13.06.2013 and on 14.06.13 purchased Nexus 4. This is also shown in your system as one of your recovery person has said this to me. 2. On 14.06.13 I had requested Mr. Akash Roy (Through mail) to stop black berry service and activate GPRS for android. 3. On June 15th I had sent a reminder for the same. (Through Mail) 4. Over Phone I was confirmed that the same has been done. 5. On 06.07.13 my first bill was raised and on 07.07.13 I had again expressed my concerns through mail & on phone to Mr. Akash Roy and was confirmed that the things would be done. 6. On 11.07.13 I had again sent a reminder and I was informed that “We have given the same for approvals. Will revert as soon as the same is processed” 7. On 13.07.13 I had sent a mail for conversion of my post-paid to prepaid. 8. On 15.07.13 received a mail from customer care about the process of conversion. 9. Replied the same Mail with cc to my RM highlighting my concerns, no reply till date. 10. On 02.08.13 I had again sent a reminder to Mr. Akash about the reversals, but no reply. 11. Followed up over the phone regarding the issues. 12. Upon the issue of the new bill on 06.08.13, again reminded Mr. Akash Roy for the new charges and reversals. 13. on 16.08.13 sent a reminder (through mail) but no response. 14. While communicating over phone I was assured about the reversals. 15. Till 15th August, the total amount of reversals to be made was Rs. 5041. 16. Received the communication that the reversals would be done. When I reminded about the conversion to prepaid as the post-paid rentals are accruing up, without any use, and was informed that the reversals would be done for the same also not to worry. 17. upon new bill on 06.09.13 again reminded Mr. Akash Roy about the earlier reversals and also about the new bill raised. If you go through the bill you will find that there is actually no usage in the number. A strange thing about the bill was that both blackberry charges and GPRS charges were levied on the same time. 18. Received the reply that Rs. 3000 would be reversed and balance needs to be paid. 19. In between the service was disconnected and people for recovery have visited my home. Also on regular basis they would call me up for recovery and they would not listen to my problem. 20. Finally on 5.10.13 my service was disconnected, and I had to write a mail explaining the things in details but it seems I was not very clear or you did not wanted to understand. 21. On 06.10 a new bill was raised and again both blackberry charges and gprs charges are charged I must have have written more than 50 emails to them but they are not ready to understand the things and are only arguing on their point. Total extra billing done by vodafone is 6290.11 and reversals done from their end is only Rs. 4500/-. They have disconnected the number and are asking for the balance payment, and only then they would restore the number. My question is why should I pay for the fault of vodafone.