Object to a debt collection demand

Dear Sir or Madam, I have received a demand from [Name of the collection agency] under reference [Reference or case number], concerning an alleged debt said to be owed to [The company said to be owed the money]. I dispute this claim. My reasons are as follows: [Why you dispute the claim] Before any further step is taken, I require written evidence of the claim: a copy of the agreement or order on which it rests, copies of the invoices, a full statement of account showing every charge and every payment, and proof that [The company said to be owed the money] has assigned the claim to you or instructed you to collect it. Until I have received these, the claim remains unsubstantiated. I do not accept the collection costs, interest and administration fees added to the principal sum. Please set out how each of them has been calculated and on what basis you consider them payable. Please suspend all collection activity while this objection is dealt with, and do not report the matter to a credit reference agency in the meantime. I ask for a substantive reply within fourteen days. If none is received, I will make a formal complaint to the body that supervises your industry. Yours faithfully, [Your name]