for complained airtel about “Message sending Failed “problem in my airtel no 9214526584

Location/place: bhilwara

Name of company/service: Airtel

Sir,
I am port my no. 9214526584 from Tata Docomo to Airtel before three month ago but after MNP I am facing problem “Message sending Failed ”
I am complaint about this many time at Airtel customer care or Toll free 198 but every time they give me Complaint Reference No. but Problem is not Solved.
my message Center no. is OK & as per instruction of customer care executive I sweep my SIM Card & Also Change My Mobile Handset but still I am facing this problem. I am very puzzled this mobile no. is 10 year old or I am not want to change this Number. Complaint no.
CLSMS31219081632 DATED 19.12.2012
CLSMS31030271631 DATED 30.10.2012
CLSMS21219067101 DATED 19.12.2012
CLSMS21107464890 DATED 07.11.2012
CLSMS31004354745 DATED 05.10.2012
etc.
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With Regards

PaWaN KuMaR ShArMa
IfFCo ToKiO GenErAl InSuRaNcE Co.LtD.