Poir service

I contacted vodacom several times regarding a other persons name that shows on one of my contract. To date they didnt correct this. Also during the day my wifi is running at +-5 Mbps but after 8 at night it drops to less than 1 Mbps and i cant do anything. When trying to phone them there is noone to assist and the self help services cant give me an answer or correct it. This has been going on for weeks now.