Should I speak up about being lumbered with the admin work?

http://www.theguardian.com/money/2014/apr/14/lumbered-with-admin-work

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Twice a week we publish the problems that will feature in a forthcoming Dear Jeremy advice column in the Saturday Guardian so that readers can offer their own advice and suggestions. We then print the best of your comments alongside Jeremy's own insights. Here is the latest dilemma – what are your thoughts?

I'm a woman in my 20s working in a marketing role at a small startup. Recently the office manager left, and instead of hiring someone new, the owners decided to get a freelance accountant for that side of the manager's role, and to farm out the administrative work between myself and the other most junior member of the team. We are the only two full-time women in the office as well as the two most junior people – no one else has been asked to share the burden.

My colleague and I are now responsible for tasks ranging from ordering food and stationery, to sorting out a plumber when there are leaks, liaising with the cleaners and nagging the others to tidy up any boxes or bits of equipment that are left around. I've been asked to get keys cut and get quotes for a new carpet to be put in. It isn't taking up a huge amount of time, but I feel as if I've been demoted.

In addition, the owners often used to ask the former office manager to do personal tasks, though she wasn't hired as a PA (such as taking their clock to be repaired, booking train tickets or ensuring the money for their son's school fees had gone through). They've very occasionally asked me to do these sorts of things in the past, and I've never known how to say no. Should I speak up? And if so, how?

Do you need advice on a work issue? For Jeremy's and readers' help, send a brief email to dear.jeremy@theguardian.com. Please note that he is unable to answer questions of a legal nature or reply personally.