Moved home

We had bulb at our old home and used the ‘moving home’ process to take our account with us to the new place. We keep receiving emails saying our account is closing, final bills etc so did an online chat with bulb where they sorted our account to the new property and said everything was all sorted. That was a week ago and we are still receiving bills from the property’s old supplier (3x our bulb payments) and emails from bulb saying account will close and no info of our new property. I have struggled to get back in contact with bulb with it being the weekend. What is the best course of action to take next?