HP India — wrong cartridge number

Dear Sir, We have MOU signed with HP on behalf of e-connect solutions, Udaipur for supply of original HP Cartridges. Since we are regular users of Original HP Cartridges, we have mistakenly ordered a cartridge set CB400/1/2/3 instead of CE400/1/2/3 on inspection we found that it does not fit in our printer. Now when we ask our vendor M/s e-connect solution to replace the cartridge with the correct serial number they are not doing so and asking for payment of the old wrongly supplied cartridges. Kindly advice on this matter since we are ready to pay for the correct cartridges but they are saying that we cannot do so. Thanks BK Roy [protected]