As I am sure you have been told clutches are considered wear and tear items and as such are not covered by the warranty. If it's found the cause is something other than a worn clutch rectification would possibly be covered by the warranty, but if it's shown to be a worn clutch you will be up for the cost of repairs, which will include the cost of tearing it down. I don't see there's any escaping that cost.

Normally the glass isn’t covered by the warranty; it comes under the wear-and-tear category and so is excluded. But a shattered rear glass would appear to be different to the regular run of glass failures. I would first attempt to negotiate with Hyundai and mount a case for compensation that they couldn’t possibly refuse. You could go to the Ombudsman, but that will take time and I would doubt if it would ultimately help.

You need to take the problem directly to Hyundai and make them aware of your frustration. Approach it calmly and armed with all of the information you have from past attempts to fix the issue, and ask for the company's help in not only fixing the reception problem, but also to restore your faith in the Hyundai product. If you don't want to pursue that course take the car to an independent radio specialist who should be able to sort it out for you.