Borrowers Trapped by Lenders

Some borrowers are finding it increasingly difficult to get new financing from their current lenders.  At a time when interest rates are at the lowest they’ve been in decades, some borrowers are finding that due to low or negative equity on their property they are unable to get fix rate money on their mortgage and take advantage of the low interest rates, despite the fact that many of these borrowers have not missed or defaulted on their payments, and were they able to get the lower fixed rates, would be in an even stronger position to carry on as they have always done or even repay their loans earlier. 

Could it be that lenders are taking advantage of their customers and the current climate, realising that these borrowers are unable to transfer their loan to alternative lenders because of  the low equity in their property, they have no choice but to accept what is on offer or rather what is not on offer…to them?