Superbalist dissapoints

It's been more than 6 weeks since Superbalist erroneously collected a Mareth Colleen top (not a Superbalist item). Now they refuse te reimburse because I don't have the invoice BUT...they cannot return the item either after sending a photo of the top proving they have it. Neither Zain, Neshaat or Danica (the junior online fashion assistants) assigned have been successfull in solving the matter after 34 emails over 1 month... The options are simple in order of preference 1) Return the top in your posession 2) Buy a new top 3) Reimburse me.