If they are barking all day and making too much noise you can try containing the environmental health department of your local authority. They maybe able to assist, but it's best to talk to your neighbours first to try and resolve it without involving the authorities. Neighbour disputes have a habit of escalating out of all proportion.
I feed my dog twice a day, so that sounds fine to me. Although I have to agree with FP... I'm hoping they have shelter for all types of weather.. but if you think that they don't look in well health or barking all day then I would consider reporting them to the RSPCA.