Reluctant millionaire Dr Mutasim Mohamed was poorer but happier yesterday as Allied Irish Banks (AIB) assured him he would receive no more communications telling him how his millions were faring.

Dr Mohamed (35), who arrived in Ireland last November, had been a millionaire for two months despite his best efforts to give the money back.

The doctor said he was very happy to have the burden of his sudden wealth taken away from him.

"I am not a millionaire and I never will be. I am a doctor and I do not want this money. I want to look after people and to help people as a doctor," he told The Irish Times.

Dr Mohamed said people who had millions only wanted to get more millions and he was not interested in that kind of life.

A doctor in Bantry general hospital, currently on study leave, Dr Mohamed received a letter from AIB in April telling him he was the owner of a fixed deposit account containing €40 million (£31.5 million).

The Sudanese-born doctor went to AIB in Bantry and told it he was not the owner of this money and asked that the error be rectified. Instead AIB wrote to him telling him his €40 million had earned him a further €161,333.33 in interest, bringing his account up to €40,161,333.33. The distressed doctor said he tried again to get AIB to take its money back but a further letter arrived telling him the status of his account.

Dr Mohamed was having none of it and went to his solicitor.

"I just wanted to be left alone to study. I do not want to be a millionaire, I want to be a doctor," he said.

He asked his solicitor, Ms Fiona Hurley of O'Donovan Murphy & Partners, to fax AIB telling it to leave her client alone and take its money back. The next day another letter arrived from AIB telling the doctor he was still a millionaire. Dr Mohamed then rang The Irish Times which contacted AIB on his behalf.

Much to his relief, Dr Mohamed said his solicitor received a letter from AIB yesterday which stated he was no longer a millionaire.

"I did not want their money and I hope I do not hear from them again," he said.

In a two-page letter to Ms Hurley, AIB said Dr Mohamed's name and address had been incorrectly assigned to a fixed deposit account belonging to another client.

"My solicitor got a letter from AIB legal services telling me there was an error." It said the bank "inadvertently assigned your client's name and address to the correspondence which should have been directed to another customer's bank in respect of a fixed deposit".

AIB acknowledged the fact that Dr Mohamed had "quite properly advised the bank on a number of occasions of the error which had arisen". It regretted the error and the fact that it was not speedily rectified, "thus causing continued inconvenience and annoyance" to the doctor.