Rust rear axle VW UP

Hello Does anyone have problems with rust on the up rear axle? Up BJ. 2/2012 60 HP 150 OOO Km. Recently after a 200Km. motorway ride I got off and saw that the right rear wheel stood up about 5 cm inwards and let itself move back and forth with the hand. On the lifting platform one saw that on the rear axle to the right a weld seam was no longer available. Absolutely lifelike. VW probably saved at the wrong place. Thin material on the rear axle but thick salaries of the man Ager.