4th day of the month And bill limit reached

Today is the 4th day of a new month and my outgoing facility is not working but receiving and data is fine. The only number i can phone is 808. Now i pay manually every month and pay extra as well but when i phoned 808 the one agent said i reached my bill limit, on the 4th with credit? this issue started presenting itself ever since i have upgraded my contract last month and i had numerous issues telling me i'm paying for data but i have 1.5gb and only used 800mb. My question is whats going on with your billing system as you have a bill limit and a call limit unbilled limit rol***** limits and a what ever other limit in place. The last 2 months was fine and i was never disconnected but now again i pay for a service which I'm not getting what is the use of a cell contract if you can't phone. I really would like to request MTN to fix their billing system as this is getting ridiculously frustrating and from what i have read i'm not the only person with this exact same complaint. I also have asked for mailed email statements but only get them when i phone 808 i don't get sms notification on reaching limits but well \You have to pa R***.*** by X time. What happened to customer service?"