Outrageous Phonebill

My Manager signed a new contract for a phone i(ncluding a 1GB data bundle) to be added to our company account. She asked for the limit to be set at R350. The account is paid by debit order and no invoices were received (from April up to and including October). After requesting last month's statement we were shocked to see the charges. I called and spoke to Nokuthula at the Call Centre who informed me that the account was open ( No limit set), she had no idea whether there was an option given to cap it nor did she suggest any way of setting a limit now. She also admitted that no notification is sent when the data bundle is finished and out of bundle rates apply. I called back and asked for limits to be set and was promised that the paperwork would be sent within the next 30 minutes - that was 90 minutes ago. My Manager now has to pay the company over R11 000 out of her own pocket for the extra charges on the account . How does a network not give you the option of capping or setting limits from the outset and why didn't they send alerts when the bundle was finished? I think it is highly ********* and a deliberate attempt to fleece the customer. Disgraceful.