call centre

i called the call center this morning as im running up a bill and wanted to know where its coming from as i have a lot of data and also using whats app bundle i also do not make any call from this sim card. the agent told me there is 2 subscriptions and gave me a code to unsubscribe; i dialed the ussd and it said no active subscriptions, i called again the 2nd agent told me the same and she said she will unsubscribe for me , i hold on the line and 15 minutes i eventually dropped the call as i dnt have time to hold on for 15 mins all i want is confirmation of this services to be stopped and i want a manager of team leader to call me back, also want to know when i subscribed to the services as the agent couldn't also tell me