Hello,
Sorry to hear that its a pain!
Depending on the size of your portfolio they offer discounts on the management fees and tenant finder fees.
The biggest point I think is they can claim the tenants other benefits via the dwp if they fall into arrears which hasn't happened to me as they have got direct payment for each property.
I'd get in touch with ashley at ssertrofdotcodotuk and mention Gerry and he will know who I am. He should be able to help you.