Tian Yu worked more than 12 hours a day, six days a week. She had to skip meals to do overtime. Then she threw herself from a fourth-floor window

She worked more than 12 hours each day, six days a week. She was compelled to attend early work meetings for no pay, and to skip meals to do overtime. Toilet breaks were restricted; mistakes earned you a shouting-at. And yet there was no training.

In her first month, Yu had to work two seven-day weeks back to back. Foreign reporters who visit Longhua campus are shown its Olympic-sized swimming pools and shops, but she was too exhausted to do anything but sleep. She was swapped between day and night shifts and kept in an eight-person dormitory where she barely knew the names of her fellow sleepers.

Stranded in a city far from her family, unable to make friends or even get a decent night's sleep, Yu finally broke when bosses didn't pay her for the month's labour because of some administrative foul-up. In desperation, she hurled herself out of a window. She was owed £140 in basic pay and overtime, or around a quarter of a new iPhone 5.

Yu's experience flies in the face of Foxconn's own codes, let alone Apple's. Yet it is surely the inevitable fallout of a system in which Foxconn makes a wafer-thin margin on the goods it produces for Apple, and so is forced to squeeze workers ever harder.

The suicide spate prompted Apple CEO Tim Cook to call on Foxconn to improve working conditions. But there is no record of him providing any money to do so, or even relaxing the draconian contractual conditions imposed on Foxconn. Asked about it yesterday, Apple's press office said it did not discuss such matters and directed me to the company's latest Supplier Responsibility report. A glossy thing, it opens with "what we do to empower workers" and describes how staff can study for degrees.

After her suicide attempt, Yu received a one-off "humanitarian payment" of ¥180,000 (£18,000) to help her go home. According to her father: "It was as if they were buying and selling a thing." Last year, Tim Cook received wages of $4m – it was a big drop on the package he took in 2011.