TracFone Straight Talk Site won't accept my monthly payments and still won't unlock phone

I have been a customer with straight talk for almost a decade and have purchased several phones from them, meaning I have spent several hundred dollars purchasing their products. I recently purchased another phone and need it unlocked so that I can leave this service provider, however they wanted me to pay a fee to unlock the phone which would've been the price I just paid at Walmart and I've already heard its next to impossible trying to get a refund even a partial one.

Why should I pay the cost of another phone just to be free and rid of their service. This all started with me attempting to add minutes and purchase their monthly plan. I'm going through all of this because neither their site nor the automated phone would process the payment. Why should I pay because their tech and phone line have some kind of glitch and won't take my payment, actually how can they take the fees if the payment refuses to be accepted Asinine.