Can't access a paper copy contract - BILLING ISSUE

I am on a 2gb per month contract with a tablet. The amount is R399p/m. Last month my bill was almost R1900 and this month my bill is almost R4000. When I did my upgrade in April 2015, at the Clearwater Mall shop, I clearly instructed them that everything on my account settings remain the same and that the usage be capped at 2gb per month and I will top up if needed. Clearly this was not done and I had to phone to find out what was going on after receiving an unexpected bill last month. So now, I have requested a paper copy of my contract and I have as such, since requesting it on 22 August, not received anything - and if I don't phone to find out what's going on, leave messages or send emails, which is not returned, I have no clue what's going on. So 1) customer services and systems are very poor because why must it take so long to get a paper copy from a filing system and you can't keep a customer informed. 2) not honouring a contract of R399 per month with a limit which was always set prior to the upgrade and asked to remain as is - capped to what I signed up for! It is unacceptable to have such poor customer service and blatant disregard for a client's instruction re billing!