Where to start?
Wallakers manage to combine arrogance and incompetence with a level of rudeness which cannot be justified.
My dealings with them are nothing but frustrating. They continuously obscure the truth and in 3 years have provided no benefit above what is legally required of them, and even that could be argued against.
Begin with an honest appraisal of how you conduct your own business. Read these reviews. Actually talk to your customers. Review your service levels. Understand why people are angry and actually do something about it.