The 20% off birthday code would have just been sent out automatically by the computer, which wouldnt know what other coupons were available at the time.
The 20% will be a standard coupon given to all on their anniversary. They cant be expected to give some people a larger coupon just because there happens to be another coupon around at the time, that would be very unfair and would result in countless complaints.
To be honest, I think complaining about the free coupon you receive is quite ungrateful and petty. They could be like Amazon and never give out coupons at all, but instead they are very generous with the discounts they give.
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