Data bundles get depleted in no time

I'm very disappointed in a manner at which my query has been handled at telkom. When I recharge my account on data bundle it gets depleted in less than 5 minutes When I call telkom I'm told it's my background apps that are running . I've been using my iPhone for a year and I never experienced such . It's seems now telkom have joined Vodacom by making data vanish in no time