Faulty Huawei battery exploding ... 2nd time happened with a device and we expected to pay ...

Vodacom sell you faulty devices from Huawei ... 2nd time that I have a router with them that has battery that heats up and swells up ... The battery appears asif it is going to explode ... I saw that I have insurance and will try to book it in for repairs but told there will be an excess fee charged ... I am dissapointed that we have to pay for fees if device is faulty in manufacturing ...