Horrible 1st time experience

It’s been 3 months without an oven but the debit order is still going off. All that was needed was to replace the hinge on on oven door, they came and took the hinge and I was let known they would order one. This was July. Last week after I followed up, they said they received the order and a guy would come and on the 22 September to fix the oven. No one showed up, no one called to say why the technician didn’t come. I followed up and now I’m being told they ordered the wrong size! So now it means I must wait for another 3 months??? This is my very 1st claim and what a horrible experience Ive received. I’m loosing customers and I cook for a living. They’re not taking this seriously. I’m so angry!