Some of the Abracs reviews on Toolstation aren't dramatically different from yours.
I'd take it back to the store, with your grinder and get a substitute blade.
John
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local