Ladbrokes complaint: Ripped Off

For years I have used this Ladbrokes shop. On Saturday I put a 10p EW Lucky 63 on. I took the guaranteed odds on all the selections and had the luck to have 2 winners. I took 201 odds for the first and it came in at SP 281. The second I took 281 odds and it came in at 201 SP. Therefore two 281 winners returning £95.58 for a £82.98 profit. When I went to pick up my winnings on Sunday they tried to fob me off with £63. I said that’s not right, they said come back tomorrow. So I did, and now they say guaranteed odds only apply to Grid Card holders. I am a grid card holder anyway, but never in the past did they tell me I had to produce my card to get those odds. The fact there is a giant screen in the shop advertising guaranteed odds implies a customer regardless of Grid Card “status” should get those odds. When an issue like this has arisen in the past Ladbrokes paid the difference without quibbling.