No customer service

Ordered a new SIM card which never was delivered. Had to call and re-order, eventually received it only to find out that it is the wrong service provider's SIM. On top of this I need to make several calls as they keep on putting you on hold and then drop the call, once this is done you have to start all over again. No supervisor nor manager wants to speak to you once you want to complain. I feel that they have no customer service and no respect for their customers. I have been a customer of theirs for more than 15 years and their service has declined more the 1000% in the last 2 years. Very disappointing and discussing.