Some members of a congressional delegation who recently returned from the Mideast have denied a charge by the U. S. ambassador to Lebanon that they refused to stay in the accommodations provided for them and ousted his overworked staff so that they could stay at the embassy.

One of the six members, Rep. Elliott H. Levitas (D-Ga.), said, "I stayed where I was told to stay in a fleabag hotel without hot water. I expected if everything was booked up or blown up, we would have to rough it."

Another member, Rep. David E. Bonior (D-Mich.) told his staff here in a telephone call from Cairo that he had stayed in the hotel, along with Mervyn M. Dymally (D-Calif.) and Paul N. McCloskey Jr. (R-Calif.). Reps. Mary Rose Oaker (D-Ohio) and Nick J. Rahall II (D-W. Va.) were also in the delegation.

Ambassador Robert Dillon told the State Department that delegation members scorned the rooms reserved for them in an un-air-conditioned building owned by the Lebanese Christian Phalangists.

Yesterday, a State Department spokesman said that because of the fighting in the country, visitors of any kind were being discouraged. The purpose of the trip was to give congressmen a first hand view of the war.