Impossible data usage charges and no assistance in investigating

<p>We have an mtn usb modem as a back up for when our Telkom ADSL is down. The device gets very rarely used and has been R89 per month since we took out the contract a couple of years ago. All of a sudden in April this year the charge shot up to R840, then in May R2187, and in June R2650! and the device was hardly used. The device was supposd to be capped so the shop messed up there but i cant find the signed contract copy to take it further. I have never taken an uncapped internet or cell phone contract before in my life because of possibilities like this. The shop was not able to assist in any way and referred me to mtn customer care. Five calls over the last 6 weeks with reference numbers logging the billing query and still no email proof of the data usage. Pathetic service again. And this just after an MTN insurance claim took 7 months to handle a broken screen claim only after we took the matter to MTN regional office in Umhlanga.</p>