Useless service provider

This must be the worst internet provider available. After informing them a month in advance of change of address and the operator being unsure as to why I am informing them in this regard, "because you only take the sim with", they have locked the sim time and time again due to the fact that the signal was now coming from a different address. Between my father and myself we had to keep phoning to have the sim unlocked, wait 60 minutes and still nothing! To describe these bunch as *********** is being kind. The only service from them is closing your ticket - whether the ticket has been resolved or not. We eventually sorted the issue ourselves without their assistance. Absolutely useless service!