New Member - Renault Clio 64 plate only 2 days old help please :) TPMS Fault

Hi, Just joined the site and looking for advice if possible , Purchased my lovely almost new 64 plate clio 1.5dci dynamique s medianav energy on new years eve ... 10 minutes after driving away from dealers i had a warning light on the dash (amber spanner & amber exclamation hazard light beside the fuel gauge) also message on the dash `Check tyre pressure sensors` I stopped the car and rang the dealers but as i was on the M62 i couldn`t turn around and go back as i live 70 miles away from them. the guy said the tyres probably just needed more air in them and was o.k to drive home and reset ... so checked pressures they seemed fine but put a little more air in anyway.. reset the dash to re calibrate the sensors and within another 10 minutes driving warning lights again and same message :( took car into local renault dealer today and i`m pretty sure they did exactly what i did as within another 10 minutes leaving the dealership same error warnings again ... has anyone else had or seen this issue? I have car booked in for diagnostics 1 week from today but they said could cost £78 if fault isn`t under warranty! I`ve only had car 2 days and it only had 300 miles on it when i bought it :confused: isn`t it just the tyre sensors not working properly? so tyres need changing? any help would be great as i love the car and apart from this it is great just so annoying as it seems to be me trying to sort problem out at my own cost .. Fuel and travelling :(