Shocking service

Asked to UPGRADE my speed. Received email and SMS confirmation on 7/7/21 it had been done but my speed is still the same. They are blaming Vumatel but nothing has been done. 3 agents advised me they had done an escalation but they hadn't opened a case??????? 1 call on the 7th, 3 calls yesterday and 4 today and still nothing. You can't speak to the person handling your case, just some person at a call centre that knows nothing. You also battle to hear the person on the other side of the line which doesn't say much about their own infrastructure. FED UP