I agree about the Santander service quality but they are not on their own. I also have a Halifax account and their service is no better. I believe that most of the consumer banks are split into two areas;
1) those that are cash rich and thus service suffers as technology is enhanced (capital spend) by these banks and the "savings" interest rates fall as they don't need to attract savers' money.
2) those that are not cash rich and thus attempt to attract more savers, this shows in their better "savers2 interest rates and their service level.
While this is an oversimplification of events, technical spend is always necessary but Santander has had a more agressive expansion philosophy than other banks and they are geared to bring in more consumer spending by cash giveaways for more "spend related" accounts.
Unfortunately, this is the way of the banking world and my advice is to use the banks and play them at their own game, in other words take them for all you can get!!!!!