In a letter, the entrepreneur accuses the prime minister of "jumping on 'everyday fixes' or bandwagons" with his latest cost of living and retail policies.
The department store made famous by sitcom Absolutely Fabulous had warned it would cease trading.
The retail group already owns just over a quarter of the German fashion brand but wants to buy the rest of it.
Mike Ashley's Frasers Group has not commented on rumours it wants to buy Gateshead's Metrocentre.
A deal was announced on Saturday ahead of the club's 7-1 win at their new home - the Coventry Building Society Arena.
The model train firm says it has seen an increase in sales over the festive period.
The takeover approach values the luxury handbag maker at £83m amid concerns about its future.
Frasers Group says the purchase of the complex demonstrates its commitment to physical retail.
The sports supplier wants to stop an exclusive deal between Newcastle United and JD Sports.
