Can I cancel a prepaid apartment lease in Asunción if the landlord changed the terms?

In Paraguayan law, a contract is 'law for the parties' (Art. 715 of the Civil Code). If you have already signed a document and paid the deposit and the first month's rent, the landlord cannot unilaterally modify the price or conditions (such as parking) without your consent. This is considered a breach of contract. To recover your money, these are the critical documents: a) The Signed Contract: This is your main proof that the price was lower and that parking was included. b) Payment Receipts: Legal proof (or transfers) of the security deposit and the first month's rent. c) Communications: Screenshots of WhatsApp messages, emails, or notes where the landlord informs you of the price increase and the removal of parking. This proves their intention to breach the agreement. Suggested Steps to Follow: a) Rejection Notice (Amicable Resolution), b) Complaint to SEDECO (Consumer Protection Service) and c) Civil Lawsuit. If you need further advice, please contact our firm.