Misinformed about warranty cover

Good Day<br> <br> I have encountered a really unfortunate situation. I entered myself into a contract for a Samsung Galaxy S4 in September 2013, in June 2014 i had sent my phone to a Samsung Repair Center in Durban. I had a cracked screen, battery over heating, and people whom i was calling or calling me could not hear me. But i was booked in for a Screen repair. They told me that the speaker issue was a fault in the mother board and they had to change it, however they never said it would use up a warranty claim if they changed it, they just said they've changed it. Anyway it was unfortunate that 3 weeks later i had dropped it and the screen cracked again, i never sent it for repairs thou due to the fact that i only had 1 screen repair remaining so i said to myself that i'll send it before my warranty expires this year September. I took my phone in there 2 weeks ago and they called me back to say that I've used up both my warranty claims, on their system they have 1 screen repair and 1 liquid damage, but i never had a liquid damage, they've said that the mother board change used up a warranty claim, but i was never informed that it would.<br> <br> The only answer I've got is nothing can be done.