Within the two-year legal guarantee period, the consumer is entitled to have the goods brought into conformity, free of charge. Firstly, consumer may require the seller to repair or replace the goods, unless this is impossible or disproportionate. Any repair or replacement shall be completed within a reasonable time and without any significant inconvenience to you, taking account of the nature of the goods.
If the repair or replacement is impossible or disproportionate (for example a trader is not able to repair or replace the purchased product; repairing of the product is unsuccessful; trader has not eliminated the defect within a reasonable time) a consumer is entitled to ask for a price reduction or to have the contract rescinded.
Expenses, relating to the elimination of the defect (postage, transportation, labor), must be paid by the trader. By staying polite and reasonable towards the trader, you have much bigger chances of finding a suitable solution to your problem.