Hello anonymous, perhaps your SIM card or mobile phone contract no longer brings you anything. There are enough offers for LTE with 21.6 MBit... So it may not be the Huawei's fault. Its specifications give the following information for LTE:

LTE FDD Cat.6 data service of up to 300Mbit/s (DL) /50Mbit/s (UL) LTE FDD Cat.4 data service of up to 150Mbit/s (DL) /50Mbit/s (UL) LTE TDD Cat.6 data service of up to 224Mbit/s (DL) /20Mbit/s (UL) LTE TDD Cat.4 data service of up to 112Mbit/s (DL) /20Mbit/s (UL)

This is what it says in the product description from Huawei.