No response to query re overcharge

I have been trying since 8 Aug through numerous e-mails and phone calls to have three simple queries re incorrect charges on my Mtn contract answered.One lady at Customer Care actually took the trouble to read the correspondence relating to my query but referred me to another department.Other than automated responses and copies of internal requests to other departments, I have until today had no response to my basic queries.<br> This reflects an attitude of disinterest and/or incompetency and is to me unacceptably poor service from a company I have been supporting for more than 15 years. This is causing me to consider switching my allegiance.