I've been paying for Giff Gaff for two family members for several years so I've been a customer indirectly. It's been nice to keep getting emails from them sayi

I've been paying for Giff Gaff for two family members for several years so I've been a customer indirectly. It's been nice to keep getting emails from them saying they're increasing allowances without changing the price and I've not had any complaints about the signal and service from the family. Vodafone are on my blacklist, I had a few bad experiences with them years ago, over a decade ago now I think about it, and vowed to never use them again. Does anyone else keep a personal blacklist of companies you won't buy from / do business with? I feel like I should write it down some day.