Around 180 jobs will be lost in the city, although 144 of the roles will be replaced in Liverpool and Leeds.
A Barclays spokesman told Mortgage Solutions: “There will be absolutely no change for mortgage brokers.”
The bank added that it was making the changes to meet customer needs.
“Part of this work is ensuring that our contact centre site processes are working efficiently to enable our teams to work together more effectively,” the spokesman continued.
“Barclays is working hard to meet customer needs and keep the customer at the heart of what we do. Part of this work is ensuring that our contact centre site processes are working efficiently to enable our teams to work together more effectively.
“Unfortunately, this means that our Contact Centre in Cardiff will be closing next year. Most jobs will move to our Leeds site with a small number going to our Liverpool site. We remain committed to all areas of the UK and will be working with our staff to find redeployment opportunities where possible.
“We are being open and transparent by sharing this proposal with our colleagues at the earliest possible opportunity and we will provide full support to them throughout the process,” he added.
Trade union Unite, which represents the contact centre staff, condemned the closure.
“Unite will continue to press for Barclays to work to mitigate these job losses but the fact is that this highly skilled and dedicated workforce will be made redundant and we call on Barclays to think again and reverse this decision,” said Unite regional officer Steve Pantak.
“This announcement comes on the back of reorganisation and redundancies from other departments within Barclays in Cardiff in the last 18 months and of course the relentless closure of bank branches not just at Barclays but also other banks.”