As you may know or not we sell RIBs too. We cover the RIBs with 8 year guarantee (hull and tubes). The RIBs are manufactured and are set up in Safrica and then they are shipping into the UK, Greece or Cyprus.
If during transit a RIB gets damaged is our obligation to put it right free of charge.
If also during the 8 years there is a defect either on the pontoons or the hull is us again who has to put it right free of charge.
I think you should go back to these clouns and tell them that is your rights to DEMAND for them to put the RIB right or you report them to the consumer association.
I don't think you need a hull survey done to protect your consumer rights which says if I'm right that, the product purchased should be fit for the intended purpose of use. Also I think you have a 12 month unconditional guarantee in force irrespective if the supplier gives one or not.
You just bought the RIB (3 months OLD???) How long was the guarantee one day??
GOOD LUCK I think you'll need it