The worst service

After writing in on Friday, I received a call from a gentleman whose name I'm having difficulty remembering and he advised me to download a Data Management app. I've since been monitoring my data usage using this tool and have identified discrepancies. I've called into your call centre numerous times asking to be put into contact with the gentleman to whom I spoke, but no one has managed to do so. I've spoken to 4 different people, yet my issue has not been resolved. 2 people have \logged"incident requests on my behalf"