There’s no eloquent way of putting this but are you fed-up of being kept on hold on an expensive non-geographic 0870 number usually waiting to complain about something that isn’t your fault and being made to pay for the pleasure? The reason the cost of these phone calls is so much higher than normal calls is because the company you are phoning takes a cut of all calls made to them.
Say no to 0870 is an excellent website that lists many land-line numbers of commonly used companies including banks and utilities. Use them.