LG G4 stuck on LG Logo

<p>Bought a LG G4 about 1 year ago and now our of the blue it doea not want to boot past the LG Logo. Took it to mtn and was told that is is because the phone was droped on the camera and that caused the boot problem. But I told them that was caused due to my keys that presed against the glass outside the camera lens as the phone is in excellent condition with no scratches or chips on cover but they want to tell me I droped it. And now want to charge me R3480 to fix what *** is this as far as i could do research this is a mainboard fault and that was also waht the person that helped me at mtn told me as he is aware that there is a problem with the pc board.</p>