Not Complying to their own offers

My Caravan were severely Damaged in an accident, Discovery then decided to pay me the full ensured amount, a Discovery employee phoned me with this news, I were happy, few minutes later he phoned me again and said he want to make it clear to me that I can keep the caravan and if I fixed it can re-insured it with them, hey then send the relevant documentation for the payment, in this document it was clearly stated that they pay the ensured amount and that I can fix the caravan and cant keep discovery responsible for the repairs, I signed and return it to them, payment were made, Then a Discovery employee send me a mail and said they will come and recover the caravan from me, I want to make it clear that I left the Caravan at Garden Route Caravans after the quotation and only collect it after I received the mandate from Discovery.

Due to the above I think it is unfair of them to come and reclaim the caravan, they had all the time in the world to ensure that all was done correctly, this claim was settled over a very long time and there were no rush from their side