Call out fee

my router stopped working, after bad weather. everything else worked that was plugged into the same adapter but the router just wouldnt work. a technician came in and said that it was a lightning strike and that the router will need to be replaced. i replaced the router and after bad weather again the same thing happend, but this time the router came on but just wasnt working. the technician came and said that there was something that wasnt working but its working now. 5 mins after he left the internet stopped working again. he came back and said that it was one of the cordless phones that blew and when its connected then the internet will not work. i then recieved my bill yesterday and i have been charged for 2 call out fees and the reason it states is unnecessary call out fee. firstly, i was not made aware of this fee and i was not aware i will be charged. secondly, how is it unnecessary? it was a product of telkoms that stopped working and i get billed for it, considering im on a 24month contract i dont think i should be liable for this.