Contact DS and tell them you have received damaged/imperfect items and they should exchange them for you. Usually, they don't want the imperfect item returned if it is low value.
There are a number of ways you could try to remove the marks. A wash in warm, soapy water might work and if it doesn't, then a scrub with a stiff tooth brush might work.
There are a range of various "magic mark removers" from, for example, Lakeland and on Amazon, which might work, as may polish or car scratch remover (I've forgotten the proper term).
A glass fibre pen might work (with a need for a polish and buff afterwards) as may various liquids, white spirit, paint remover, metal polish.
Any or all might work but any or all might also leave marks afterwards.