Hello @mmarijic ,

Welcome to our community. 

According to Google Translate,  it seems that your connection briefly establishes and then drops. If there is any discrepancy, please describe it in English.

Here are some suggestions that may help:
1. Enable SRA (Seamless Rate Adaptation): Access your router's management page via tplinkmodem.net, log in, go to Advanced > Network > DSL Settings, and enable SRA. This helps stabilize the DSL connection.
2. Check your DSL cable connection: Remove any DSL splitters or filters, and connect the router directly to the front wall jacket to reduce interference. This is especially important with new connections.
3. Replace the DSL cable: If possible, try a different DSL cable to rule out cable damage.
4. Configure Google Public DNS: This can improve reliability. Go to Advanced > Network > Internet and change the DNS to 8.8.8.8 and 8.8.4.4. (Guide: How to change DNS servers)
5. Restart your equipment: Power cycle both your router and any front-end device from Vodafone.

Best Regards.