HELP! My bank account is getting internet defrauded.

So I've had to have my bank cancel my debit card for the 2nd time in about a month. The first time somebody got away with 5 new pairs of Adidas and Fred Perry trainers, some t-shirts and jeans from Burtons and River Island and about 12 very large JustEat takeaway orders. Over £900 worth of fraudulent transactions.

This time I have managed to catch the fraud early, I notice a Netflix payment coming out of my bank account this morning. It's obviously a test transaction as I have never used Netflix.

This must be internet related because nobody has access to my debit card, it's ALWAYS in my wallet. I need advice, what precautions should I take to safeguard my internet use?

I use my card for payments online if I can't use PayPal and I always thought I had good security set up on my laptop, McAfee Live Safe came pre-installed.

The fact that somebody was able to get my new card details so quickly has got me worried, I cant just keep canceling my bank card every time this happens.

What steps do I need to take to make my PC safe for use?

Should I contact my ISP?

What internet security programs should I use?

Any help is much appreciated!