excellent quick service but after sales is poor

i ordered my new mobility scouter through this company and they were great i ordered it on 1st aug and it arrived ready built on the 6th aug and there prices are great,
BUT last month i called the help line number as the controls were sticking it was driving by its self and was promised a mobility engineer would call me within 2 days its now 19th oct and im still waiting
SO there after sales don't exist ?
its now 4th november still no response leaver still sticking why should i pay another company to fix this for me you get a years warranty .+ they had the cheek to send me extended warranty info. well thats a joke why would you want a extended warranty when the dont even bother to pass on your problems:{