how come BT offer great broadband deals for new customers, but dont care about reducing prices for existing?

Cancel your agreement and then you can get 6 months at reduced rate. Causes loads of extra work for BT and you get a better deal. Rip off Britain strikes again!!!!!!
It doesn’t answer the question why they don’t look after their loyal customers without me having to resort to dirty tricks though

I suggested I was considering switching and they offered £5 per month discount to stay with them for another year.
So I did.
Once that's up I'm looking again as I've heard sky can do faster connection speeds around our way even though BT say we can't go any faster..

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