Several players using the same account

It is becoming a lot more noticeable that players are sharing top accounts and using them 24 hours a day. When you see writing change from English to American or vice versus then it as clear as mud.
There is no action being done about it yet my bookie can tell me which device I am on and a location within 20 miles. It is clear that this is cheating and appropriate action needs to be taken over wise it is easier and cheaper for 4 players to max one account than 4 accounts