BUILDER'S DON'T HONOUR QUOTE

Went to buy outdoor storage cabinets. Were given a written quote but because I'm a pensioner were advised to come back on the Wednesday to claim my 10% discount. Went back on Wednesday but when going to pay was advised the cabinets were on special so no discount allowed. NOT WHAT WE'RE WERE TOLD ON THE WEEKEND! Phoned their customer service and they said the cabinets were not in special!! Wrote to them and was again the cabinets were on special and that the customer service did not always know what was going on. So very dissatisfied customer?☹