rocky horror show broken?

hi, i have a rocky horror show fruit machine, when i switch it on, it dosent work as it shoud, its a £10 jackpot but shows up a £15 jackpot, its a 20p play but shows up a 25p play, when the money is put in it takes the money but does not register a a shot, the play stays at zero, and if and only if the reels spin it wont let me spin it anymore once the hold buttons flash, it seems to stick, then it comes up wi the writing jackpot key(whatever that is) and at certain times the alarm goes off for no reason, is there a memory battery in this machine if so where if not then whats wrong with this machine....please please help....