Can my bank deny access to my HELOC funds just for slow payment when my payments are now on time and up 2 date

for a year I stayed 1 to two months behind on my payments but I made all my payments. I spoke to a different company about refinancing and that company submitted a paper to my bank to start the payoff process. the bank then stopped all activity to my HELOC in anticipation of a payoff. The other company said that they could not refinance me. I contacted my bank, to have the block removed and they denied me, saying that I had a history of slow pay and that I needed to reaply. Prior to that, I had no problem with my account. Can they do that?