Ghost typing, faulty touchscreen and speaker

A month ago my phone (S4 Active) ran an update on the wifi, and since then the touchscreen is not working at times and sometimes ghost types. Samsungs ADH warranty does not offer cover for my product, due to the parts that are used in this product. The screen is not cracked or damaged visibly but there is definitely a problem with the internals. The speaker on the top of the device (for calls) also now is very faint and the volume is turned up to the max. Why does Samsung release a device for which it does not offer support or repairs?! One of their consultants tried to help using the smart tutor app, but I cannot accept the terms and conditions on the screen as the touchscreen is not working properly.<br>