SINGAPORE - Former China tour guide Yang Yin has refused to meet the lawyers representing Madam Hedy Mok, the niece of widow Chung Khin Chun.

Her lawyers Peter Doraisamy and Andrew Lee had earlier received permission from the Prisons Department to visit 40-year-old Yang, who is behind bars, so they could inform him about an application to get Madam Chung's new will recognised by the courts.

In an earlier will made in 2010, the 88-year-old had left all her assets, believed to be worth $40 million, to Yang, who has been accused by Madam Mok, a 61-year-old tour agency operator, of taking advantage of her aunt.

The new will leaves most of her money to charity, and nothing to Yang.

The lawyers were informed on Sunday that Yang "refused" to meet them, said Mr Lee who at a closed-door hearing to recognise the new will on Wednesday.

Yang's lawyer Joseph Liow said he will be meeting his client on Wednesday afternoon to take instructions on whether he should represent him for the will application.

Madam Chung, who has no children, was diagnosed with dementia last year.

Yang, who has been in remand since Oct 31 last year, now faces more than 300 charges, including two criminal breach of trust charges for allegedly misappropriating $1.1 million from Madam Chung.

On Tuesday, his lawyer Wee Pan Lee, who is representing him in the criminal case, said the prosecution has not said which charges they will be proceeding with.