Fixing tires??

Hello guys, I got a new rear wheel tire at my GPZ 500 almost 2 weeks ago (Bt 45) there was a screw in my old one! NUN BIN I BON’T WEEKING in a nail apparently. My tyre dealer wants 30 Euro for the “friendship price” for patching by means of bolts which is plugged through from the inside and cast away! However, all insurance technical without guarantee or similar! Has anyone ever had experience with this? Is that safe? a new tire costs 85Euro + m 15 Euro are proud 100 Euro. If the three times are the same, I would like to know your opinions on the subject of tires patching by means of bolts!