ROME, Oct 17 (Reuters) - Italian Prime Minister Giorgia Meloni's party urged the country's economy minister to protect the interests of Intesa Sanpaolo clients being moved onto the bank's mobile-only service Isybank, a lawmaker said on Tuesday.

Isybank, a cloud-based, low-cost mobile bank, is a key plank of Intesa CEO Carlo Messina's plans to reduce the group's costs and focus costly branch staff on value-added wealth management and non-life insurance services.

Letizia Giorgianni, a lawmaker from Brothers of Italy's party, called on Economy Minister Giancarlo Giorgetti to intervene to allow clients more time to opt out of what she called a "forced migration" to the new unit.

Intesa was not immediately available for comment.

The move comes after several initiatives by the ruling coalition that have sparked alarm among investors, including a surprise windfall tax on banks and proposals to give borrowers the right to repay their bad debt at a discounted price.

Italy has backtracked on both, but investors said confidence had been damaged.

Isybank targets some 4 million Intesa customers who generate around 200 million euros ($211.68 million) in revenues a year and could become more profitable if shifted away from branches given they already only use digital bank services.

After launching Isybank in June, Intesa this week started moving about 300,000 customers from it traditional bank network, Giorgianni said.

By changing the code that identifies current accounts, the project risks disrupting people's payment, she added.

"Notice of this forced migration, sent between June and July, triggered protests by many customers, as shown by the many complaints received from various consumer associations, because it was sent in a rather questionable manner."

Asked to clarify how he intends to handle the issue, the economy minister is expected to reply during a Q&A session scheduled for Wednesday at the lower house of parliament.

"Once again the trust relationship between banks and customers has been undermined," Giorgianni said in the parliamentary question to the minister of which Reuters saw a copy.

Intesa Sanpaolo forecast its new digital bank would save around 800 million euros a year in 2026-2027, up from 600 million euros in 2025, according to a strategy presentation delivered in February last year.

($1 = 0.9448 euros) (Reporting by Giuseppe Fonte; Additional reporting by Valentina Za; Editing by Josie Kao)