I think the key word here is "believe". Unless you know exactly how much remains on your loan, you can't really make an informed decision about what to do.
Secondly, if you have a high outstanding balance, then they are quite right to repay the PPI to the loan, as it isn't money you have actually paid out, if you are still owing it. If the loan was paid off altogether, it would be different.
However, this is all academic until you get a statement showing it all, then you can work out what's the best next step, so I would suggest you do that first and foremost.

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