Partserve service delay

Jobcard JN255946 Canon printer handed in for repair 5/3/2024. First they claim that they cannot find my guarantee registration, so I have to pay. they quote on a repair for which they have no parts nor any idea of when they are available. they insist on payment in advance. they take my money. Then advise that the repair cannot be done until the parts arrive at some vague time in the future. they appear to be using my money, at my expense to fund their business. Quite frustrating indeed.