Incorrect Billing

My girlfriend took out a package from Mondo where they cold called her and advised her about a package for R179 per month for 11 Gigs total data on Telkom and includes a MIFI pocket router.

During the call she was told that it is a top up contract and should the 11 gigs deplete she could purchase additional data to continue use, otherwise the service would stop until the month cycle was over and the following months data was issued.

It seems that the data depleted and the contract kept rolling as an open billing account and as a result the bill is R367.15. How is this possible on a top up contract?

She was strictly advised that this would not occur where out of bundle rates would apply.

Mondo May call me and I will advise on the details necessary.