CONSULTANTS WANT ME TO SIGN UP FOR ITEMISED BILLING TO GET ANSWERS

Recently received my bill with 2 strange charges, upon emailing Vodacom to Inquire what these charges are for. I was advised to sign up for itemized billing at a fee of R17.00 and this will tell me what the charges are for as the consultants are unable to see. If i do sign up for itemized billing then it will tell me how long and when a call was made but not the number, also i apparently used USSD code but they cant tell me what USSD code. I didnt know that vodacom now charges for using the *111# USSD code???!! as i dont use any USSD codes for banking or buying airtime. This is highly frustrating. You cant tell me what USSD code and cant view what landline number i called? My account was capped at spend R0 after all my bundles have run out, this somehow unlocked itself as well.