Do UK Visa Application Forms expire?

I'm applying for an Exemption Vignette Visa for the UK from Italy. I made a mistake and I need to start over. I'd like to cancel the current application (I still have to bring the requested documents to the application center) but in order to do so I need to send a cancellation request and I have to pay for it.
Unfortunately, my cards are not accepted. My question is: is the visa application going to expire anyway? Or should I really cancel it? On the website it is written that the application form is available to download until February 2020, so I assume they cancel these incomplete applications anyway.
Best Answer
If you have submitted your application
If you have submitted your application you should pay tour fee which can later be refunded.
2 ongoing visa applications won’t be allowed.
The UK GOV website states:
Contact UKVI to find out how to cancel your application.
You can only get your fee refunded if your application hasn’t been processed yet.
If you haven’t submitted your application
If your application hasn’t been submitted you can just start again and if asked just say you made a mistake.
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