If there was no formal contract with the first company there can be no condition of contract which compels you to pay their account in full prior to the switch. The switch should have been honoured and the second company should be charging from that date. Are you saying that you have been billed by two companies for the same period?
Your remedy would be an action for damages representing the amou thou would have saved had the switch over happened when you asked for it.
Please scan and send a copy of the relevant court papers to***@******.*** and ask the moderator to forward toCustomer
Thanks for sending the summons. There is a statutory obligation to pay water charges under the various bits of legislation they quote in their statement of claim. However your defence is, as I understand it, that they didn't implement the request for you to transfer to another supplier notwithstanding that you said you would pay their charges up to that time. That appears to me to be a good defence to the action or at least for the charges occurring after that date.