Poor customer Services

I had my dish installed in October 2014 using Golden Rewards 2009 cc. which was the service provider i was given when i contacted Ellies to redeem my voucher. Two months later the dish fell off and hung on the side of the roof for 2 days before the installers came to fix it. Last night i when i turned on my tv i got a E48-32 error which says theres no signal. I took my decoder to an agent and the decoder worked ok and they advised me to call my installer because it could be a faulty connection because my installation is fairly new. I called the installer and they say i must pay a call out fee for them to see whats wrong because the workmanship guarantee is only 3 months, but surely if the decoder is ok then it could be that when the dish fell it damaged the allanby or the alanby was faulty to begin with. now why must i pay for them to fix a problem that could their fault, if its a faulty alanby then Ellies should pay not me. Im so dissapointed about the service.