Halifax has come under fire over its levels of service, with brokers complaining of not being able to reach its business development managers.
The high-street lender also saw its online system crash on Monday although service was resumed the next day.
Brokers say it can take several hours to get hold of a Halifax BDM, only to get directed to the wrong one.
Brentchase Financial Services mortgage specialist Mike Fitzgerald says: “We feel they should have a look at it and make sure it is just a temporary problem.”
Personal Touch Financial Services sales director Dev Malle says: “We need to put the service into context. Halifax has one of the best products in the marketplace at the moment.”
Halifax Intermediaries managing director Jack Saxton says: “We have been experiencing very high demand over the past fortnight via the phone and online. The vast majority of our applications are still offered within 14 days and, following the technical problems, online applications are now up to date.”