Is the reel under a year old? Still under guarantee? Do you have a receipt for it? If you can answer all these questions with 'YES' bring it back to the shop.
If there is any 'NO' answer then just forget it, these low end reels are cheap and not built to last.
Go to the tackle shop where you bought it and ask for a good quality replacement reel, this shouldn't cost you more than 70-100 Euros and you most certainly get a rebate for the banjaxed one if you are in good standing with them. They surely value your repeat custom if they have any business sense.
Last but by no means least -
you have consumer rights: Keep in mind the 3R's - Repair, Replace, Refund.
If it cant be repaired the shop has to replace the faulty item, should they be unable to do so for any reason you have the right for a refund. Simple as that. And please do not tamper with the reel yourself, this voids the guarantee. Hope this helps.