The government is being urged to tighten rules on the sale of insurance products after the family of a mentally ill woman filed a complaint against DBS Bank for misleading her into signing a HK$500,000 contract. DBS Bank is alleged to have persuaded Cheung Chau-ping, 56, who was diagnosed with schizophrenia in 2006, to sign an insurance policy in 2007. The contract requires her to pay about HK$100,000 per year over five years for a retirement savings scheme - under which she would receive monthly payments of HK$6,000 a month for 10 years from the age of 65. Her family found out about the contract this year. The family said Ms Cheung had been misled because she could not remember signing the contract. The family filed a complaint yesterday with the Legislative Council's complaints division after DBS declined their request to terminate the contract and reimburse the premiums already paid. Eastern District councillor Tsang Kin-shing, who is helping Ms Cheung, called on the government to tighten regulations on the sale of insurance products to protect the consumer rights of the mentally ill. Ms Cheung yesterday could neither recall whether bank staff had persuaded her to sign the contract nor any details of how she came to sign the documents. Husband Sun Lai-ho, who accompanied Ms Cheung to Legco, said his wife had been misled by bank staff. 'My wife was mentally unstable, had illusions and needed medical treatment. It was impossible for her to make an independent judgment to sign the contract,' he said. Mr Sun said his wife signed the contract without a member of her family present. The family had complained to DBS Bank and the Consumer Council. Mr Sun said the council had been investigating and the bank declined their reimbursement request. DBS asked the family to fulfil the contract or lose all the premiums already paid. A DBS Bank spokeswoman said Ms Cheung and her family had been contacted, and it had offered to exempt four months of the premiums. Ms Cheung had confirmed she had no mental disorder in a declaration she submitted to the bank, the spokeswoman said. Meanwhile, a spokeswoman for the Office of the Commissioner of Insurance said no law existed to prohibit selling insurance products to mental patients. A 14-day cooling-off period was set up in 1996.