Billing errors

<p>Every month for last 3 to 4 months I have billing errors on my account on my second number. First few months it was resolved and my account was credited. Now this month they are saying that we asked for an increased spend limit but they cannot tell me how or when!! I was told a manager will call me (second time now) and still nobody has called me. Absolutely no issues on my first contract but nobody can sort out the problem on my second contract!!! The service with these queries has been awful!!! SO FRUSTRATED that I must phone every molnth to sort this out!!</p>