Start of contract

Just switching from another provider who's contract ends at the end of April to Virgin Media but unfortunately the two have overlapped.  Arrangements had already been put in place to cancel the former so I thought when arranging Virgin there would be an option for a start date, big mistake there isn't and although trying god knows how many times to contact Virgin to discuss all I get is a moronic AI voice talking options none of which are relevant.  It seems impossible to talk to a real human being, initially it asks for a password which I created when setting up an account but refuses to accept leading again to a brick wall, the password was a random set of letters and figures but asks as if its a proper name.  Why are communication companies the worse people to contact, its ridiculous. Even clicking links on their web pages lead nowhere or are dead links.  This has got off to a bad start and I dread to think what the future holds.