The moment you realise you have entered into an agreement and are being nailed by an unscrupulous service provider, better known as WASPs (wireless application service providers), you can do one of the following, depending on who your service provider is, says MyBroadband:

For Cell C: Using the USSD string *133*1#, subscribers can block all existing and future content billing.

For MTN: Dial *141*5# and select which services to unsubscribe from.

And for Vodacom: Vodacom users can unsubscribe from all WASP services by sending “STOP ALL” to 30333.

Remember that most of these WASPs (third-party companies) that get subscribers’ money via an agreement with the networks are perfectly legal. The onus is on you to make sure you do not fall foul of them.