Why would the guy you bought it from pay half the bill? Contact the garage who did the work..
I don't get any of this thread. Why would it suddenly stopping automatically mean timing belt? All the symptoms initially just pointed to a dead battery imo.
The belt slipped due to a pulley failure looks like the pully wasn't changed the crank pulley is also very wobble the rubber is knackered and bolt wasn't change this happened at 70mph so its done damage made worse by repeated attempts to start it and an attempt to bump start it,
The guy who sold me it lied the garage claim they never done the work the belt however is new so its a badly done at home.
I paid 800 for the car it was advertised for 1200 but he knocked money off when because of aux belt and and sensor needed done.
Only bought it as a weekend toy but love the wee thing now so don't want to scrap it, I considered just buying another but with all the trouble I had with it after it gets an engine what else can go wrong.
I intend to buy an engine off someone on here so at least it helps support our community and much more trust worthy than off eBay